| List-I (Railway Zone) | List-II (Headquarter) |
| (A) South Central | (I) Bilaspur |
| (B) South Eastern | (II) Hubli |
| (C) South East Central | (III) Kolkata |
| (D) South Western | (IV) Secunderabad |
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?