Consider the following statements with respect to the matrices: P = | 0 c -b | | -c 0 a | | b -a 0 | and Q = | a2 ab ac | | ab b2 bc | | ac bc c2 | I. PQ is a null matrix. II. QP is an identity matrix of order 3. III. PQ = QP Which of the above statements is/are correct?

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: