Let A, B be two 2 x 2 matrices. Which one of the following is true....

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Let A, B be two 2 x 2 matrices. Which one of the following is true. (a) If A? = 0, then A = 0, where 0 is the 2 x 2 zero matrix. (b) If A? = A, then A = 0 or A = I2, where I, is the 2 x 2 identity matrix. %3D (c) AB = BA. %3D (d) (A+ B)(A - B) = A² – B? %3D (e) None of the above is true. Let A, B be two 2 x 2 matrices. Which one of the following is true. (a) If A? = 0, then A = 0, where 0 is the 2 x 2 zero matrix. (b) If A? = A, then A = 0 or A = I2, where I, is the 2 x 2 identity matrix. %3D (c) AB = BA. %3D (d) (A+ B)(A - B) = A² – B? %3D (e) None of the above is true.