Study the table given below:
Select the option where contraceptive/contraceptive method are correctly matched with their mode of action.
A – The pill: Inhibits ovulation (III).
B – Condom: Prevents sperm from reaching the cervix (I).
C – Vasectomy: Semen contains no sperm after the vas deferens is cut or tied (IV).
D – Copper-T: Prevents implantation of the fertilized egg (II).
If vector \( \mathbf{a} = 3 \hat{i} + 2 \hat{j} - \hat{k} \) \text{ and } \( \mathbf{b} = \hat{i} - \hat{j} + \hat{k} \), then which of the following is correct?