
The transverse section (T.S.) of a mature anther includes the following wall layers:
Epidermis: Protective outermost layer.
Endothecium: Helps in the dehiscence of the anther to release pollen.
Tapetum: Provides nourishment to the developing pollen grains.

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?