Which of the following sets are subspace of M2x2? (a) All 2 x 2 matrices of the form ( 2) where a+b+c+d = 0. (b) All 2 x 2 matrices of the form ( ) where a + d = 1. (c) All 2 x 2 matrices of the form (ª :) where ab - cd = 0. d

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