Which statement about using the keepalive command on a tunnel interface is true?

Which statement about using the keepalive command on a tunnel interface is true?
A . It can be configured on either side of the tunnel or on both sides
B . It can be configured only on the downstream side of the tunnel
C . If it is configured on both sides of the tunnel, the values must match
D . It can be configured only on the upstream side of the tunnel

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Answer: A