Explanation: this is the only correct answer, since we are talking about "Internal" authentication scheme, the only valid answer is the Operating System authentication because the authentication occurs locally to the user.
Incorrect Answers
A:When we talk about dynamic passwords we often talk about an external security server changing the access password in a continuos basis, the user usually see the current password with the help of a hardware Token, an example is RSA.
B:Radius is an external security server, the authentication is checked remotely.
C:AXENT is an external security server, the authentication is checked remotely.
D:TACACS is an external security server, the authentication is checked remotely.

Explanation: one of the uses of the "Verify Policy" command is that it can check if two or more rules conflict with another one. For example if you have a cleanup rule as the first in the rule base it will deny access of the traffic to any other criteria below.
Incorrect Answers
A:This is not the primary purpose of the policy verification, the main purpose of the verification is to achieve functionality and correct syntax and conflicting rules.
B:When you verify a policy you are making it at the management server, not at the enforcement modules.
D:In policy verification there is not a compression procedure.
E:This is obviously wrong, it is always good to verify your policies, is one of the best practices recommended by Checkpoint engineers, see Checkpoint Policy deployment help at their web site.