The Harappan civilization, one of the earliest urban cultures, showcased advanced urban planning:
1. Grid Pattern Town Planning: Cities like Mohenjo-Daro and Harappa were built on a grid layout, with streets intersecting at right angles.
2. Drainage System: A sophisticated underground drainage system ensured sanitation and hygiene.
3. Public and Private Architecture: Cities had public structures like the Great Bath and granaries alongside private dwellings with standardized bricks.
4. Trade and Commerce: Harappan cities were centers of trade, with evidence of interactions with Mesopotamia and Central Asia.
5. Standardized Weights and Measures: Uniform systems of weights and measures indicate organized economic activities.
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?