In a determinant a of order 3, a, denotes the element in ith row and jh column. i = 1, 2, 3 and j= 1, 2, 3. if a, = a, for all i and j then the elements in prin

In a determinant A of order 3, a, denotes the element in ith row and jh column. i = 1, 2, 3 and j= 1, 2, 3. If a, = a, for all i and j then the elements in principal diagonal are necessary (A) 1 3. - 1 (B) 0 (C) (D) None of these