which of the following should not be dropped at the internal networks firewall?

In an intranet environment, which of the following should not be dropped at the internal networks firewall?

A.
Inbound packets with the Source Routing option set

B.
Router information exchange protocols

C.
Inbound packets with an internal source IP address

D.
Outbound packets with an external destination IP address

Explanation:
Normal outbound traffic has an internal source IP address and an
external destination IP address. Traffic with an internal source IP address should
only come from an internal interface. Such packets coming from an external interface
should be dropped. Packets with the Source Routing option enabled usually indicate a
network intrusion attempt. Router information exchange protocols like RIP and OSPF
should be dropped to avoid having internal routing equipment being reconfigured by
external agents.