Gabarito "B"
Conforme wikipedia:
A public-key infrastructure (PKI) is a set of hardware, software, people, policies, and procedures needed to create, manage, distribute, use, store, and revoke digital certificates.[1]
In cryptography, a PKI is an arrangement that binds public keys with respective user identities by means of a certificate authority (CA). The user identity must be unique within each CA domain. The third-party Validation Authority (VA) can provide this information on behalf of CA. The binding is established through the registration and issuance process, which, depending on the level of assurance the binding has, may be carried out by software at a CA, or under human supervision. The PKI role that assures this binding is called the Registration Authority (RA). The RA ensures that the public key is bound to the individual to which it is assigned in a way that ensures non-repudiation.[citation needed]
Prezados , segundo a RFC 2459 que especifica infraestrutura
de chaves públicas X.509 ( utilizada pela ICP-Brasil ) , vemos que os
componentes do modelo são :
“end entity: user of PKI
certificates and/or end user system that is the subject of a certificate;
CA:certification
authority;
RA:
registration authority, i.e., an optional system to which a CA delegates
certain management functions;
repository:
a system or collection of distributed systems that store certificates and CRLs
and serves as a means of distributing these certificates and CRLs to end
entities.”
Portanto , vemos que a alternativa correta é a letra B ,
registration authority ( RA ) , que no Brasil chamamos de autoridade de
registro ( AR )
Fonte : https://www.ietf.org/rfc/rfc2459
A alternativa correta é : B.