Which of the following descriptions about the Keepalive message in BGP is wrong?

Which of the following descriptions about the Keepalive message in BGP is wrong?
A . Keepalive messages are mainly used to maintain the connection between BGP peers
B . The Keepalive message contains only one BGP data header
C .  By default, the Keepalive interval is 180 seconds
D . Keepalive messages are periodically sent between two BGP neighbors

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Answer:   C