For a long shunt compound generator with a supply current of 20A, field current of 30A, load current of 40A, and armature current:
(a) Is​=20A,If​=30A,Ia​=40A
(b) Is​=30A,If​=40A,Ia​=20A
(c) Is​=40A,If​=30A,Ia​=20A
(d) Is​=30A,If​=20A,Ia​=40A