Port scanners and packet sniffers differ in functionality because:

A.
packet sniffers and port scanners are just different names for the same device.

B.
packet sniffers can only log events on traffic activity and port scanners can route malicious
packets.

C.
packet sniffers watch all traffic over certain ports and port scanners watch traffic on certain NICs.

D.
port scanners are limited to detecting open ports and packet sniffers watch all traffic.