Buffers are employed between different levels of memory hierarchy to reduce access latency. For this given configuration, list the possible buffers needed between L1 and L2 caches, as well as L2 cache and memory.

Recall that we have two write policies and write allocation policies, and their combinations can be implemented either in L1 or L2 cache.

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L1 a. Write through, non-write allocate b. Write through, write allocate L2 Write back, write allocate Write back, write allocate