Why did the network architect likely design the VoIP system with gratuitous ARP disabled?

A post-implementation review has identified that the Voice Over Internet Protocol (VoIP) system was designed to have gratuitous Address Resolution Protocol (ARP) disabled.

Why did the network architect likely design the VoIP system with gratuitous ARP disabled?
A . Gratuitous ARP requires the use of Virtual Local Area Network (VLAN) 1.
B . Gratuitous ARP requires the use of insecure layer 3 protocols.
C . Gratuitous ARP requires the likelihood of a successful brute-force attack on the phone.
D . Gratuitous ARP requires the risk of a Man-in-the-Middle (MITM) attack.

View Answer

Answer: D