ANS:D - All the above processing

Time sharing, On-line processing and Interactive processing terms could be used to describe the concurrent processing of computer programs via CRTs, on one computer system.

Time-sharing is a technique which enables many people, located at various terminals, to use a particular computer system at the same time. Time-sharing or multitasking is a logical extension of multiprogramming. Processor's time which is shared among multiple users simultaneously is termed as time-sharing.

Online processing is an automated way to enter and process data or reports continuously as use as the source documents are available.

Interactive processing is the simplest way to work on a system. So answer is correct.