Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control?

Where D.C. motor of H.P. 12 or more requires frequent starting, stoppi

1.	Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control?
A.	Drum type controller is used
B.	Three point starter is used
C.	Four point starter is used
D.	All above can be used
Answer» B. Three point starter is used