Which statement is true regarding the use of Inmarsat-C for sending emails?

The correct answer highlights the flexibility of the Inmarsat-C system in managing email communications. With Inmarsat-C, users have the option to send emails using two primary methods: they can select recipients from an address book or manually input the email address. This dual functionality makes it convenient for users to send messages to known contacts quickly or to enter new addresses as needed.

The system's design accommodates various user preferences and enhances usability by allowing both methods of email sending. This approach helps ensure that crew members onboard vessels can communicate efficiently, regardless of whether they're reaching out to someone frequently or initiating contact with a new recipient.

Inmarsat-C is specifically structured to facilitate email communications effectively, thus making it a reliable tool for transmitting emails for maritime operations. While the other options touch on aspects of Inmarsat-C's functionality, they do not accurately reflect the operational capabilities concerning email usage.