Which of the following should the security engineer do to ensure IMAPS functions properly on the corporate user network?

A security engineer has been asked to close all non-secure connections from the corporate network. The engineer is attempting to understand why the corporate UTM will not allow users to download email via IMAPS. The engineer formulates a theory and begins testing by creating the firewall ID 58, and users are able to download emails correctly by using IMAP instead.

The network comprises three VLANs:

The security engineer looks at the UTM firewall rules and finds the following:

Which of the following should the security engineer do to ensure IMAPS functions properly on the corporate user network?
A . Contact the email service provider and ask if the company IP is blocked.
B . Confirm the email server certificate is installed on the corporate computers.
C . Make sure the UTM certificate is imported on the corporate computers.
D . Create an IMAPS firewall rule to ensure email is allowed.

Answer: C