单项选择题
Which email protocol allows an email client to download email messages to the local computer？（）
- A.IMAP4
B.SMTP
C.TCP
D.POP3
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Apache is a popular example of what type of networking software？（）
A.Web server B.Browser C.Email server D.Email client
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Which two encryption protocols might be used to provide secure transmissions for browser and Web server communications？（）
A.HTTP and HTTPS B.SSL and TLS C.SSL and HTTP D.TCP and UDP
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In the client-server model, what is the primary protocol used for communication between a browser and Web server?（）
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