Study the following statements and identify the correc combinations of statements.

Statements:

(A)  For bridge designing, the design live load of standard Class 70R, Class A, Class B, Class AA are used.

(B)  In class 70R, For tracked vehicle, The nose to tail spacing between two successive vehicles shall not be less than 90 m for tracked vehicle.

(c)  In class 70R, For wheeled vehicle, spacing between successive vehicles shall not be less than 45 m. 

(D)  In class A, The nose to tail distance between successive trains shall not be less than 18.5 m.