Select the correct option to substitute the given set of

Device that converts digital signals to analog signals at the start of long-distance transmissions is

Which of these devices helps a computer understand human commands?

What is the function of the puck?

What does URL stand for in web browsing?

What is the mounting of file system?

Antivirus software is classified as:  

Hard disk can be formatted at the time of

 The data remains the same after saving the file and turning off the computer-

Who invented email?

Communication controls for the entire computer system?