For various combinations of write policies and write allocation policies, which combinations make the protocol implementation simpler?

Memory consistency concerns the views of multiple data items. The following table shows two processors and their read/write operations on different cache blocks (A and B initially 0).

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a. b. A A = 1; B 1; B = 2; A+=2; B++; 2; A=5; B++; P1 = C C P2 B; D = A; B; D = A;