单项选择题
Which client-server application allows an administrator to control a remote computer, but does not encrypt or secure the communication between client and server?（）
单项选择题 Which email protocol allows an email client to read mail stored on the mail server？（）
单项选择题 Which email protocol allows an email client to download email messages to the local computer？（）
单项选择题 Apache is a popular example of what type of networking software？（）
