How does a Junos device learn about MAC addresses when II is first connected to an Ethernet LAN?

How does a Junos device learn about MAC addresses when II is first connected to an Ethernet LAN?
A . The device sends out a network broadcast message asking tor all devices and MAC
addresses on the network and stores this information In addition lo the interface from which the response was received.
B . The device learns the destination MAC addresses from traffic in the network and stores this MAC address in addition to the interface from which the traffic was received.
C . The device learns the source MAC addresses from traffic in the network and stores this MAC address in addition to the interface from which the traffic was received.
D . The device sends out a network multicast message asking for all devices and MAC addresses on the network and stores this Information in addition to the interface from which the response was received.

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Answer: C