The displacement of a particle is proportional to the cube of time. Then magnitude of its acceleration

If the displacement of a particle is proportional to the square of time, then-

The displacement of a body is given to be proportional to the cube of time elapsed. The magnitude of the acceleration of the body is

The displacement of a particle starts from rest is proportional to the square of time, then the particle travels with

The displacement of a particle starts from rest is proportional to the square of time, then the particle travels with

The displacement of a body is proporticonal to the cube of time elapsed. What is the nature of the acceleration of the body ?