The figures show the contact pressure distribution in pure clayey soil subjected to a uniformly distributed load (udl) through rigid footing (placed on the surface).

Which of the following would cause the contact pressure distribution to maximum at the centre and decrease towards the outer edges leading to a parabolic shape?

1. When udl is transmitted through rigid footing placed on the surface of cohesionless soil. 

2. When udl is transmitted through flexible footing placed on the surface of cohesive soil.

3. When udl is transmitted through flexible footing placed on the surface of pure clay. 

Select the correct answer using the codes given below.