The ________ authentication problem is that unless individuals are carefully vetted before being allowed in a system, imposters can simply enroll through social engineering.

• A. Prime
• B. Core
• C. Final
• D. Human

Answer: (A)

The main issue here is proving who a user is before granting access. If people aren’t carefully vetted before they’re allowed to enroll, social engineers can impersonate someone and enroll themselves, bypassing technical safeguards. That makes the primary, foundational problem the authentication process faces at the very start—the prime problem of identity proofing during enrollment. The other terms don’t capture this pre-authentication risk as clearly: final implies something about an end stage, human would shift focus to people rather than the onboarding process, and core would be awkward or less precise in this filling.