Let $A=\left[a_{i j}\right]$ be a 2 × 2 matrix such that $a_{i j}=\frac{|-3 i+j|}{2}$ then $a_{21}$ is:

$-\frac{1}{2}$ $\frac{5}{2}$ $-\frac{5}{2}$ $\frac{1}{2}$

$\frac{5}{2}$

The correct answer is Option (2) - $\frac{5}{2}$