Which of the following statements about applying common security techniques to computing resources is correct?

a$.$

Hypertext Transfer Protocol Secure $($HTTPS$)$ operates over port $80$ by default.

b$.$

Transport Layer Security $($TLS$)1\mathrm{.}3$ prevents downgrade attacks, reducing handshake messages.

c$.$

Secure Sockets Layer $($SSL$)$ primarily secures File Transfer Protocol $($FTP$)$ communications.

d$.$

TLS $1\mathrm{.}3$ cipher suites include Rivest, Shamir, and Adelman for bulk encryption.