Correct Answer - Option 3 : Proxy Server
- A proxy server is basically another computer which serves as a hub through which internet requests are processed.
- Proxy servers or services can run on dedicated hardware devices or as software on a general-purpose machine, responding to input packets such as connection requests, while blocking other packets. Proxy types of Server filters Website Traffic.
Therefore pption 3 is the correct answer
Important Point:
POP Server
- POP (Short for Post Office Protocol) is a protocol used to retrieve e-mail from a mail server. Most e-mail applications (sometimes called an e-mail client) use the POP protocol, although some can use the newer IMAP (Internet Message Access Protocol).
- There are two versions of POP. The first, called POP2, became a standard in the mid-’80s and requires SMTP to send messages. The newer version, POP3, can be used with or without SMTP.
Database server
- A database server is a server that uses a database application that provides database services to other computer programs or to computers, as defined by the client-server model.
Mail Server
A mail server is the computerized equivalent of your friendly neighborhood mailman. Every email that is sent passes through a series of mail servers along its way to its intended recipient