Which of the following is not a recovery technique?

Which language was used to prepare an Internet page at the beginning of Internet Technology? 

Computer and communication technologies, such as communication links to the Internet that provide help and understanding to the end user is known as–

Which one is not a Internet protocol?

Which of the following is not an  Input device? 

Which of the following is not an Operating System ?

Which multiplexing technique used to transmits digital signal?

Father of ‘C’ programming language