Nelson is a consultant. He is at a customer’s site reviewing configuration and logs as part of a security audit. Nelson sees logs accepting POP3 traffic, but he does not see a rule allowing POP3 traffic in the Rule Base. Which of the following is the most likely cause? The POP3:

A.
service is a VPN-1 Control Connection.

B.
rule is hidden.

C.
service is accepted in Global Properties.

D.
service cannot be controlled by NGX.

E.
rule is disabled.