单项选择题

安全工程师被要求在公司防火墙上关闭所有不安全的端口,他已经禁掉了21,69,80,137-139端口,放开22和443端口,下列哪个协议是他禁掉的和放开的?()

A.Blocked:TFTP,HTTP,NetBIOS;Allowed:HTTPS,FTP
B.Blocked:FTP,TFTP,HTTP,NetBIOS;Allowed:SFTP,SSH,SCP,HTTPS
C.Blocked:SFTP,TFTP,HTTP,NetBIOS;Allowed:SSH,SCP,HTTPS
D.Blocked:FTP,HTTP,HTTPS;Allowed:SFTP,SSH,SCP,NetBIOS