For different layers of cement concrete floor. Pick up the incorrect statement from the following :

A)
The lowest layer consists of consolidated ground
B)
A 10 cm lime concrete (1 : 4 : 8) is laid on clean sand
C)
A 10 cm thick clean sand is laid on consolidated ground
D)
A 10 cm thick cement concrete (1 : 2 : 4) is laid on top layer.

Correct Answer :   A 10 cm thick cement concrete (1 : 2 : 4) is laid on top layer.