An administrator is opening a firewall to allow encrypted communication with a website. Which of the following is the administrator MOST likely to open on the firewall?

TCP:143 is the port for IMAP (Internet Message Access Protocol), used for receiving email, not for encrypted web communication.

UDP:143 is not a standard assigned port for any relevant protocol and does not relate to encrypted web traffic.

TCP:443 is the well-known port for HTTPS (HTTP over TLS/SSL), which encrypts all communication between a browser or client and a web server. The TCP transport protocol is required because HTTPS relies on the reliable, ordered delivery that TCP provides for the TLS handshake and subsequent data exchange. Allowing TCP:443 through the firewall is the standard method to permit encrypted website traffic.

UDP:443 is associated with the QUIC protocol used in HTTP/3, not with standard HTTPS - the conventional and most widely expected answer for encrypted web communication remains TCP:443.