Which of the following statements is true regarding an ETA's responsibilities?

The statement that an ETA (Entity Trust Authority) protects from unauthorized access is true regarding its responsibilities. An ETA plays a crucial role in a Public Key Infrastructure (PKI) by providing trust services that ensure the integrity, authentication, and confidentiality of data transmitted over a network. By verifying identities and issuing digital certificates, the ETA helps to establish secure channels of communication and prevents unauthorized users from gaining access to sensitive information.

The other choices indicate responsibilities or actions that do not align with an ETA's legitimate functions. For instance, issuing unauthorized tokens undermines the trust model of PKI, while performing competing duties would conflict with their primary responsibility of maintaining integrity and security. Additionally, while an ETA operates alongside Local Registration Authorities (LRAs), it typically does not engage in their functions, which focus on user registration and identity verification. Therefore, the role of an ETA centers on safeguarding against unauthorized access, making this statement accurate.