Xiao Ye believed Tao Ying only pretended he was short so she could avoid paying for his ticket, while in fact he was tall and distrusted his mother. As a result, the mother and son had a falling out.
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?