An attacker attempts to create a DoS event against the VoIP system of a company. The attacker uses a tool to
flood the network with a large number of SIP INVITE traffic. Which of the following would be LEAST likely to
thwart such an attack?

A.
Install IDS/IPS systems on the network

B.
Force all SIP communication to be encrypted

C.
Create separate VLANs for voice and data traffic

D.
Implement QoS parameters on the switches