Which of the following protocols provides end-to-end encryption for securing email content from unauthorized access?

Explanation

S/MIME (Secure/ Multipurpose Internet Mail Extensions). S/MIME is used for encrypting and digitally signing emails to ensure secure email communication. IMAP (Internet Message Access Protocol) → used for receiving emails. SSL (Secure Sockets Layer) → secures network connections, not email content encryption. SMTP (Simple Mail Transfer Protocol) → used for sending emails.