Why is NTP an important component when implementing IPSec VPN in a PKI environment?
A.
To ensure the router has the correct time when generating its private/public key pairs.
B.
To ensure the router time is sync with the remote peers for encryption keys generation.
C.
To ensure the router time is sync with the remote peers during the DH exchange
D.
To ensure the router time is sync with the remote peers when generating the cookies during IKE phase 1.
E.
To ensure the router has the correct time when checking certificate validity form the remote peers.