Match the following Column I with Column II and choose the correct option.
| Column I (Dynasties of Vijayanagara) | Column II (Contributions) |
|---|---|
| a. Sangama | i. Strengthened military |
| b. Saluva | ii. Belonged to Krishnadeva Raya |
| c. Tuluva | iii. Constructed Hiriya canal |
| d. Aravidu | iv. Last dynasty of Vijayanagara empire |
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?