Select the correct answer. What will be the output of an input M ORed with itself according to the idempotent law?
A. M

B. M+M

C. M. M

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D. M

M∠abc=138° and m∠def=31° . which statement is true about ∠abc and ∠def ? a: the angles are neither complementary nor supplementary. b: the angles are complementary. c: the angles are supplementary.