Arrange the following steps of sewage treatment in a sequential order.

(A) Primary effluent passed in aeration tank
(B) Activated sludge is formed
(C) Filteration and sedimentation of sewage
(D) Aerobic microbes grow into flocs

Choose the correct answer from the options given below:

(C), (A), (D), (B)

The correct answer is Option (3) → (C), (A), (D), (B)