SMBs often handle IT needs with the help of a systems administrator. They are always the opposition on deployment of IP telephony because of complicated QoS configuration. For SMB customers who are not experts, what is an advantage of Cisco Unified Communications solutions in implementing QoS?

A.
A Cisco Unified Communications solution is a reliable solution, so QoS is not needed.

B.
AutoQoS allows administrators to easily set up policies to deliver high-quality voice.

C.
Cisco Unified IP phones accept more jitter and loss than IP phones from the competitors.

D.
QoS is enabled on every ISR by default.