Question: Suppose hardware was designed to incorporate three reference bits rather than the single bit used in the LRU implementation described in Section 12.3. Explain how

Suppose hardware was designed to incorporate three reference bits rather than the single bit used in the LRU implementation described in Section 12.3. Explain how a better approximation to LRU could be achieved using the 3-bit field than can be achieved using the single reference bit.

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