Explanation
The correct answer is (d) HD→RAM→Cache→CPU Register.
Explanation:
In computer architecture, the memory hierarchy is organized based on access speed, cost, and capacity. As we move closer to the CPU, the access speed increases significantly. The speed relationship can be represented by the following inequality:
Access\ Speed: HD < RAM < Cache < CPU\ Register
Hard Disk (HD): The slowest, as it is mechanical/secondary storage.
RAM (Random Access Memory): Faster than hard drives, acting as primary volatile memory.
Cache Memory: Located closer to or on the CPU, providing much faster access than RAM.
CPU Register: The fastest memory component, located directly inside the CPU to store data currently being processed.
Therefore, ordered by increasing speed, the sequence is:
Hard Disk→RAM→Cache→CPU Register
