Answer (B) is correct . An online, real-time system permits interaction between the system and the user. Such a system can be designed to guide data entry by prompting (asking questions of) the user. Automatic teller machines are common examples.
Answer (A) is incorrect because Overflow occurs when too large a number is attempted to be stored in the CPU’s memory, but an overflow control does not provide assistance to the inexperienced user.
Answer (C) is incorrect because It is an access control.
Answer (D) is incorrect because Checkpoints are “snapshots” of data values and program indicators taken periodically in a batch processing run. They are useful as a means of recovery in the event of a temporary hardware failure.
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