Assume Device $1$ has sent an ARP packet to Device $2.$ As Device $2$ builds the reply, how does it

know what specific address to use as the destination address for the ethernet frame containing

the reply.

a$.$ It will have to do its own ARP request asking Device $1$ for its MAC address.

b$.$ It will use Device $1$s MAC address, which it knows because it was sent in the ARP request

from Device $1.$

c$.$ It will use Device $1$s IP address, which it knows because it was sent in the ARP request from

Device $1.$

d$.$ Since this is a reply to an ARP request, the ethernet frame doesn$$t need a destination

address.