Which of the following statements about token issuance and registration is true?

• A. The TA must return 2842 after issuing a token
• B. The TA must issue a token before any registration
• C. The TA never returns 2842
• D. The 2842 is optional

Answer: (A)

The thing being tested is the handshake that happens after a token is issued—the system must send back a definite acknowledgment to confirm issuance before moving on to the next step. The statement that the TA must return 2842 after issuing a token reflects that requirement: 2842 serves as a concrete confirmation that the token issuance completed successfully, establishing a known, verifiable state for the subsequent registration process.

This is why it’s the best answer: without returning that specific code, the requester wouldn’t have a guaranteed way to know issuance succeeded, which could lead to errors or invalid registrations. The other statements imply things about order or about the code’s necessity that aren’t aligned with the defined protocol behavior—whether the code is optional, or whether issuance must happen before any registration, doesn’t capture the essential confirmation step represented by returning 2842.