Final answer:
The major part of swap time is Transfer time. This refers to the time it takes to transfer data between the main memory and the secondary storage.
Step-by-step explanation:
The major part of swap time is Transfer time. This refers to the time it takes to transfer data between the main memory (RAM) and the secondary storage (such as the hard disk drive).
When a program needs to access data that is not in the main memory, it needs to swap out some of the existing data from the main memory and bring in the required data from the secondary storage. This transfer of data between the two storage types takes time. So, the major part of swap time is the transfer time.
For example, consider a situation where a program needs to access a file that is stored on the hard disk. When the program requests the file, it is swapped into the main memory. The time it takes for the file to be transferred from the hard disk to the main memory is the major part of the swap time in this case.