You are asked to deploy graceful restart in your OSPF network.
What are two requirements to accomplish this task? (Choose two.)
A.
All routers must have restarting and helper modes enabled.
B.
All routers must have redundant Routing Engines with graceful Routing Engine switchover
(GRES) enabled.
C.
All routers must be configured for nonstop routing.
D.
All routers must support nonstop forwarding.