What is the area of the rectangle having vertices A, B, C and D with position vectors \(\rm -\hat{i}+\dfrac{1}{2}\hat{j}+4\hat{k}, \ \hat{i}+\dfrac{1}{2}\hat{j}+4\hat{k},\) \(\rm \hat{i}-\dfrac{1}{2}\hat{j}+4\hat{k} \ and \ -\hat{i}-\dfrac{1}{2}\hat{j}+4\hat{k}\ ?\)
1
1/2 square unit
2
1 square unit
3
2 square unit
4
4 square unit