What are three ways that graceful Routing Engine switchover provides redundancy?

What are three ways that graceful Routing Engine switchover provides redundancy? (Choose
three.)

A.
by preserving interface and kernel information

B.
by reducing time of RE failover

C.
by preserving the data plane information

D.
by preserving the control plane information

E.
by not restarting the PFE

Explanation: