Final answer:
Multi-level cache provides the CPU with the fastest access to frequently used data, as it is built into the CPU or very close to it. RAM is also fast but slower than cache, and secondary storage has the slowest access time.
Step-by-step explanation:
The CPU, or Central Processing Unit, requires fast access to data to operate efficiently. Multi-level cache is closest to the CPU and provides the fastest access to frequently used data. Cache memory is faster than other types of memory because it is built into the CPU or situated very close to it on the motherboard, facilitating rapid data exchange. Flash memory, while faster than traditional hard drives, is not as fast as cache or RAM. Random Access Memory (RAM) is quick, but still slower compared to the CPU's cache, and is used by the CPU for storing the data that is actively being worked on. Secondary storage, such as hard drives or SSDs, offers slower access times as it is farther away in the memory hierarchy.
The unit for one million bytes of computer memory is a megabyte (MB). This term often comes up in discussions of RAM and storage capacities.