Which message delivery option is used when all devices need to receive the same message simultaneously?

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Which message delivery option is used when all devices need to receive the same message simultaneously?

duplex
unicast
multicast
broadcast

Explanation: When all devices need to receive the same message simultaneously, the message would be delivered as a broadcast. Unicast delivery occurs when one source host sends a message to one destination host. The sending of the same message from a host to a group of destination hosts is multicast delivery. Duplex communications refers to the ability of the medium to carry messages in both directions.

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