Which is the likely source of the issue?

After filtering a fw monitor trace by port and IP, a packet is displayed three times; in the i, I, and o
inspection points, but not in the O inspection point. Which is the likely source of the issue?

A.
The packet has been sent out through a VPN tunnel unencrypted.
B. An IPSO ACL has blocked the packet’s outbound passage.

C.
A SmartDefense module has blocked the packet.

D.
It is due to NAT.