List the possible values of the given cache block for a correct cache coherence protocol implementation. List at least one more possible value of the block if the protocol doesn’t ensure cache coherency.

Cache coherence concerns the views of multiple processors on a given cache block. The following table shows two processors and their read/write operations on two different words of a cache block X (initially X[0] = X[1] = 0).

a. b. X[0] ++ X[1] X[0] =10; X[1] = P1 3; = 3; X[0] X[0] = = P2 5; X[1] +=2; 5; X[1] +=2;