Study the following statements and identify the number of correct statements

Statements:

(A): Shoring is required to strengthen the existing foundation which has settled and caused cracks in the wall

(B): Underpinning is required when the defective walls of a building are to be dismantled and rebuilt and support is necessary to the floor and roofs connected to that wall

(C): Shutterings are temporary structure, usually of timber, is erected close to the work to provide a safe working platform for the workers and to provide a limited space for the storage of building materials

(D): Whenever concrete is placed, it is in a plastic state. It requires to be supported by temporary supports and casing of the desired shape till it becomes sufficiently strong to support its weight. This temporary casing is known as formwork