Question: f4. In each case, determine whether or not S is a subring of the ring M2(Z). If S is not a subring, identify at least

\f4. In each case, determine whether or not S is a subring of the ring M2(Z). If S is not a subring, identify at least one ring condition that fails. If S is a subring, decide if S is commutative and find the unity, if one exists. For those that have a unity, identify the elements in S that have a multiplicative inverse in S. a) S

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