Which of the following services is part of S/MIME?

S/MIME, or Secure/Multipurpose Internet Mail Extensions, is specifically designed to provide secure email communication by enabling features such as message integrity and authentication. This is vital in ensuring that the messages sent are both unchanged during transit and verified to come from the purported sender.

Message integrity is achieved through the use of cryptographic hash functions, which ensure that any alteration of the message content will be detectable. Authentication, on the other hand, helps to confirm the identity of the sender, preventing impersonation or fraudulent messages. These capabilities are essential in maintaining trust in email communications, especially in professional and sensitive environments.

The other options do not align with the functions provided by S/MIME. Data compression and archiving do not relate to the secure transmission of emails, while remote access and monitoring, along with firewall configuration, pertain to network security measures rather than specific email security protocols like S/MIME.