Select the correct alternative of the basis of the given statements on the drainage system of the Harappan civilisation.

Statement I: In most of the Harappan cities, the houses had open drainage systems outside.
Statement II: In the Harappan civilisation, water and garbage used to drain out from the drains located outside the houses and go into the main underground drain.

A

Only Statement I is true.

B

Neither Statement I nor Statement II is true.

C

Only Statement II is true.

D

Both Statement I and Statement II are true.