仅仅允许到主机1.1.1.1的SMTP邮件服务的命名访问控制列表语句是()。
A.ip access-list standard cisco permit smtp host 1.1.1.1 B.ip access-list extended cisco permit ip smtp host 1.1.1.1 C.ip access-list standard cisco permit tcp any host 1.1.1.1 eq smtp D.ip access-list extended cisco permit tcp any host 1.1.1.1 eq smtp