What should the administrator do on the aggregation layer switches to alleviate this issue?

An administrator has an aggregation layer of 8325CX switches configured as a VSX pair. The administrator is concernedthat when OSPF network changes occur, the aggregation switches will respond to the changes slowly, and this will affectnetwork connectivity especially VoIP calls, in the connected access layer switches.

What should the administrator do on the aggregation layer switches to alleviate this issue?
A . Implement bidirectional forwarding detection (BFD).
B . Reduce the hello and dead interval timers
C . implement route aggregation
D . implement graceful restart

Answer: A