Secure Shell (SSH) is a protocol used to securely access remote devices over an unsecured network. It provides encrypted command-line access and is a lightweight and secure method of remote administration.
A). Site-to-site VPN connects entire networks, not just a single host.
B). Telnet is not secure; it transmits data (including credentials) in plaintext.
C). Console access is direct via serial cable, not remote.
# Reference:
CompTIA Network+ N10-009 Official Objectives: 2.6 - Configure and troubleshoot remote access.