Answer :
Final answer:
The second A in the AAA model is Authentication. Option B, where a one-time password is keyed in and the login system grants access, is an example of authentication. Hence the correct answer is option B
Explanation:
The second A in the AAA model stands for Authentication.
Out of the options given, option B is an example of the second A in the AAA model. When a one-time password is keyed in and the login system grants access, it verifies the identity of the user, which is a form of authentication.
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