Correct Answer - Option 3 : non-uniform, with maximum at the ends and minimum at the centre
In flexible footings pressure is uniform.
In rigid footings settlement is uniform.
Contact pressure distribution of Rigid footing over cohesive soil:
For rigid footings, the settlement has to be uniform over the contact area. Since, a flexible footing produces a dish shaped pattern in clay soil; the contact pressure must be more near the edge of the loaded area and less near centre, in order to produce a uniform settlement.
Contact pressure distribution of rigid footing over granular soil:
For a rigid footing, where the settlement has to be uniform, the contact pressure is more near the centre then near the edges.
