What is "keepalive"?
a. A keepalive is a small, layer-1 bit message that is transmitted by a network device to let directly-connected network devices know of its presence.
b. A keepalive is a small, layer-2 message that is transmitted by a network device to let directly-connected network devices know of its presence.
c. A keepalive is a small, layer-2 message that is transmitted by a network device to let it neighbors know of congestion
d. A keepalive is a small, layer-3 message that is transmitted by a network device to let directly-connected network devices know of its presence.
e. A keepalive is a small, layer-3 message that is transmitted by a network device to let it neighbors know of congestion
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