Which feature allows users to send messages to multiple recipients simultaneously?

The option identified correctly emphasizes the use of Carbon Copy (CC) as a feature that allows users to send messages to multiple recipients simultaneously. When you utilize the CC field in an email, all recipients in that field receive the message simultaneously, and they can see the email addresses of all other recipients included in the CC. This is particularly useful for keeping everyone in the loop during a conversation or when sending out information to multiple contacts concurrently.

Group Email stands out as a similar concept, as it allows for sending a message to a group with a single address; however, it isn't specifically about showing the addresses of multiple recipients. The Blind Copy feature (BCC) sends emails to multiple recipients without revealing their addresses to one another, which serves a different purpose—maintaining privacy. Message Forwarding involves sending received messages to someone else and is not inherently designed for simultaneous contact engagement. Each of these other options serves a different function than the straightforward capability represented by Carbon Copy, which maintains visibility among recipients while facilitating a collective communication effort.