Answer» Correct Answer - Option 5 : BIOS
The correct answer is BIOS.
- Due to the fact that the main memory is volatile, when we turn on our computer, the CPU cannot access the main memory directly. However, there is a special program called BIOS stored in ROM that is accessed for the first time by the CPU.
- BIOS contains the code, by executing which, the CPU access the very first partition of the hard disk that is MBR.
- It contains a partition table for all the partitions of the hard disk.
- Since, MBR contains the information about where the operating system is being stored and it also contains a program that can read the boot sector record of the partition, hence the CPU fetches all this information and load the operating system into the main memory.
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