The correct answer is: C. Access time
Access time is the time it takes for a computer or other data storage device to locate and read or write data from a storage medium. It is usually measured in milliseconds (ms).
Seek time is the time it takes for a hard disk drive to move the read/write heads to the correct track on the disk. It is usually measured in milliseconds (ms).
Effective time is the total time it takes for a computer to complete a task. It includes the time it takes to access data, process the data, and write the results back to storage.
Real time is a term used to describe a system that responds to input immediately. For example, a real-time system might be used to control a machine tool or to monitor a patient’s vital signs.
None of the above is the correct answer because it does not describe the time for which a piece of equipment operates.