To solve this question, the user needs to know about computer networking and the basic commands used to manage network connections.

Option A, TERMINATE, is not a valid command to terminate a connection with another computer. There is no such command in computer networking.

Option B, DELETE, is not a valid command to terminate a connection with another computer. This command is used to delete files or directories, not network connections.

Option C, CLOSE, is the correct command to terminate a connection with another computer. This command is used to close a network connection or a file stream.

Option D, None of the above, is incorrect because option C, CLOSE, is the correct command to terminate a connection with another computer.

Therefore, the answer is: C. CLOSE.