which network device would the QoS mechanism low latency queuing (LLQ) most likely be configured?

Refer to the VoIP network shown in the exhibit. On which network device would the QoS mechanism low latency queuing (LLQ) most likely be configured?

A.
The branch router

B.
The branch switch

C.
The branch IP phones

D.
The HQ CallManager

E.
The HQ IP phones

F.
The HQ switch