Find all the subgroups of a cyclic group of order 12.
(A) {e},(a^{6}),(a^{4}),(a^{3}),(a^{2}),(a)
(B) (a^{12}),(a^{6}),(a^{4}),(a^{3}),(a^{2}),(a)
(C) (a^{12}),(a^{6}),(a^{4}),(a^{2}),(a)
(D) (a^{12}),(a^{6}),(a^{4}),(a^{3}),(a^{2}),(a),{e}
order of a subgroup must divide the order of group but it does not necessarily mean all that divisors are a subgroup
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