JEE Advanced 2020 Full Test 1 Paper 2

Let M be a 3×3 orthogonal matrix. Let A be the 2×2 matrix in the upper - left corner of M and let B the 1×1 matrix in the lower - right corner of M. Let M1 be the 3×3 matrix whose first 2 columns are first 2 columns of M and whose remaining 1 columns is the last column of I3. Let M2 be the 3×3 matrix whose first 2 columns identical to I3 and the last 1 columns those of M. Which of the following is(are) correct?