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RFC 4530
This document describes the LDAP/X.500 'entryUUID' operational attribute and associated matching rules and syntax. The attribute holds a server-assigned Universally Unique Identifier (UUID) for the object. Directory clients may use this attribute to distinguish objects identified by a distinguished name or to locate an object after renaming.
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Atributo e regras de correspondência associadas e sintaxe. O atributo Possui um identificador universal exclusivo (UUID) atribuído pelo servidor para objeto. Os clientes de diretório podem usar esse atributo para distinguir Objetos identificados por um nome distinto ou para localizar um objeto Depois de renomear.
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Complementando:
RFC 4122 - A Universally Unique IDentifier (UUID) URN Namespace
Abstract
"This specification defines a Uniform Resource Name namespace for UUIDs (Universally Unique IDentifier), also known as GUIDs (Globally Unique IDentifier). A UUID is 128 bits long, and can guarantee uniqueness across space and time. ..."
RFC 4530
1. Background and Intended Use
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A Universally Unique Identifier (UUID) is "an identifier unique across both space and time, with respect to the space of all UUIDs" [RFC4122]. UUIDs are used in a wide range of systems.
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E ainda:
As new objects are created in Active Directory, they are assigned a unique number called a GUID (globally unique identifier). The GUID is useful because it stays the same for any given object, regardless of where the object is moved. The GUID is a 128-bit identifier, which isn't particularly meaningful to users, but applications that reference objects in Active Directory can record the GUIDs for objects and use the global catalog to find them even after they've moved.
Fonte:
Active Directory - Chapter 11 from Introducing Windows 2000 Server, published by Microsoft Press
(http://msdn.microsoft.com/en-us/library/bb742424(printer).aspx)
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Pessoal, letra E.
A razão para o qual não pode ser a letra B) DN (Distinguished Name) está abaixo... quem marcou entenderá:
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" The DN is not fixed for an object, so it can change. For example, when the file is moved to a different subdirectory, the full file name (DN) changes. This is also for the DN of an object in directory services. Whenever some attributes of the object change, the DN of that object also changes.
To uniquely identify objects, the LDAP server assigns a "Universally Unique Identifier (UUID)" to each object.
Compared to the DN, the UUID never changes until the object is deleted."
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Fonte: https://books.google.com.br/books?id=WzIfBAAAQBAJ&pg=PA77&lpg=PA77&dq=diferen%C3%A7a+DN+e+UUID&source=bl&ots=PYESBciYnt&sig=h0A08qX_jsHLOb14jmYWN5C0KV0&hl=pt-BR&sa=X&ved=0ahUKEwig3svvq5bWAhUC4SYKHdAsApAQ6AEIODAC#v=onepage&q=diferen%C3%A7a%20DN%20e%20UUID&f=false