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

1. A and B have the same number of rows.

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

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

4. A and B have the same number of columns.

If the orders of matrices A and B are m × n and p × q respectively, then which of the following is true for the product BA?

1. m = p

2. m = q

3. n = p

4. n = q

If $\begin{bmatrix} 2 & 4 \ 3 & 2 \end{bmatrix} \times P = \begin{bmatrix} 6 \ 8 \end{bmatrix}$, then the order of matrix P is:

1. 2 × 2

2. 2 × 1

3. 1 × 2

4. cannot be determined

If A = $\begin{bmatrix} 3 & -6 \end{bmatrix}$ and B = $\begin{bmatrix} 3 & -1 \ 4 & 3 \end{bmatrix}$, then the order of matrix AB is:

1. 1 × 2

2. 2 × 1

3. 2 × 2

4. 1 × 3