Answer:
Toolbar grants direct (quick) access to a set of desired commands in a toolbar that is always visible no matter which ribbon tab is selected.
Explanation:
Given
D. Enumerations! Because I know that is NOT a leg compentent of a structure
When the network stack translates an IP address (network address) to a MAC address (data link address) it sends a broadcast using ARP to all devices on the subnet asking who has the specified IP address. The device with that IP address will then respond with it's MAC address to the ARP message's source.
With this in mind the answer to your question would either be broadcast or ARP request depending on what you have been learning in class.