单选题下列哪一项是FTPServ-U的登陆失败返回信息？（）A Notlogged in Login failedB Log in incorrectC User username cannot log inD Login again
题目
单选题
下列哪一项是FTPServ-U的登陆失败返回信息？（）
A
Notlogged in Login failed
B
Log in incorrect
C
User username cannot log in
D
Login again
Notlogged in Login failed
Log in incorrect
User username cannot log in
Login again