Which of these could be the issue?

The network administrator has created two network access control rules in Cisco Security Agent in order to block NetBIOS traffic; however, traffic is still passing and Cisco Security Agent is not filtering it. Which of these could be the issue?

A.
Cisco Security Agent received those access control rules after the machine booted.

B.
Cisco Security Agent received those access control rules before the machine booted.

C.
NetBIOS ports open during the session connection and cannot be filtered beforehand.

D.
Cisco Security Agent access control rules do not support NetBIOS filtering.