Let A be a matrix of the form a b0 d such that a, b, d ∈ {-1, 0, 1} and (I - A)3 = I - A3, where I is the 2 × 2 identity matrix. The number of elements in such a set of matrices is:

If matrix A = [[1, 0], [-1, 1]], then find An.

If matrix A = [[1, 0], [0, 3]], then find the value of A5.

Given below are two statements, one labeled as Assertion (A) and the other as Reason (R): Assertion (A): A matrix in which the number of rows and columns are equal is called a square matrix. Reason (R): A matrix is called a unit matrix if all diagonal elements are zero and non-diagonal elements are unity. In light of the above statements, choose the correct answer from the options given below: