Question: We can easily implement LRU in a 2 - way set associative cache. Instead of timestamps, what do you use to implement LRU with a

We can easily implement LRU in a 2-way set associative cache.
Instead of timestamps, what do you use to implement LRU with a 2-way associative set?
Why would it be far more challenging to implement LRU in a 4-way set associative cache?
What replacement strategy should we use instead for a 4-way set associative cache?
Why do we not implement any replacement strategy for a direct-mapped cache?

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