Which of the following protocols establishes a connection to the specific server or computer, and is mainly used to download or transfer files?Group of answer choicesOPCFTP/SFTPDDEDCOM

The protocol that establishes a connection to a specific server or computer, and is mainly used to download or transfer files is FTP/SFTP.

Here's a step-by-step explanation:

1. FTP stands for File Transfer Protocol. As the name suggests, it's a protocol used for transferring files over the internet or a network.

2. SFTP stands for Secure File Transfer Protocol. It's a version of FTP that adds a layer of security. The 'S' in SFTP stands for 'secure'. It means that data being transferred is encrypted, so it can't be intercepted and read by others.

3. OPC, DDE, and DCOM are not primarily used for file transfer. OPC is a set of standards and specifications for industrial telecommunication. DDE stands for Dynamic