The product AB of two matrices A and B is possible if

1. A and B have same number of rows.

2. A and B have same number of columns.

3. The number of columns of A is equal to the number of rows of B.

4. The number of rows of A is equal to the number of columns of B.

If A = $\begin{bmatrix$}[r] -1 & 2 \end{bmatrix} \text{ and } B = \begin{bmatrix}[r] 1 & -2 \ 0 & 3 \end{bmatrix}. Which of the following operations is possible ?

1. A - B

2. A + B

3. AB

4. BA

A, B and C are square matrices of order 2 such that AB = C.

Assertion (A): Product BA need not be equal to C.

Reason (R): Matrix multiplication is not associative.

1. Assertion (A) is true, but Reason (R) is false.

2. Assertion (A) is false, but Reason (R) is true.

3. Both Assertion (A) and Reason (R) are correct, and Reason (R) is the correct reason for Assertion (A).

4. Both Assertion (A) and Reason (R) are correct, and Reason (R) is incorrect reason for Assertion (A).

If A = $\begin{bmatrix$}[r] 3 & -2 \end{bmatrix} \text{ and B} = \begin{bmatrix}[r] -1 & 4 \ 2 & 0 \end{bmatrix}

Assertion (A): Product AB of the two matrices A and B is possible.

Reason (R): Number of columns of matrix A is equal to number of rows in matrix B.

1. Assertion (A) is true, but Reason (R) is false.

2. Assertion (A) is false, but Reason (R) is true.

3. Both Assertion (A) and Reason (R) are correct, and Reason (R) is the correct reason for Assertion (A).

4. Both Assertion (A) and Reason (R) are correct, and Reason (R) is incorrect reason for Assertion (A).