The correct answer is:
(a) Cloud sessions
Cloud sessions, when using secure protocols like HTTPS (SSL/TLS), are encrypted, making them difficult or impossible to sniff effectively. Unlike FTP passwords, Telnet passwords, or chat sessions (which can transmit data in plaintext without encryption), cloud sessions often utilize secure connections that prevent easy interception and sniffing of sensitive information.
FTP passwords, Telnet passwords, and chat sessions, when not secured with encryption, can be captured via sniffing tools on a network because they transmit data in plaintext.