问题：
[单选题] Secure Shell (SSH) is a cryptographic network protocol for （请作答此空） remote login and other secure network services over an（ ）network.The standard（ ）port for SSH is 22. The best known example applicatio
A、secure
B、insecure
C、sftp
D、scp
参考答案：
A、secure
● 参考解析
