Refer to the exhibit.

SH3 and SH4 are able to optimize HTTP sessions from Client41 to application host Server31. However,
Client41 receives a failure messagE. “ftp connect: Unknown error number” while trying to connect Server32.
The same applies to Client42. Note that SH3 and SH4 are in auto-discovery mode. Client41 and Client42 are
able to ping Server32. What is the most likely cause of this failure?

A.
The network interface card (NIC) at Server32 is down

B.
The FTP service running in Server32 is down

C.
An outbound access-list specified at R3f0 denies IP traffic from Client41 and Client42

D.
An outbound access-list specified at R3f0 denies FTP control traffic from Client41 and Client42

E.
The routing protocol between R3 and R4 is configured wrong