Identify the increasing order of voltage regulation of the following dc generators a same load :
(A) differential compound, shunt and under compound
(B) shunt, differential compound and under compound
(C) under compound, shunt and differential compound
(D) shunt, under compound and differential compound
(A) differential compound, shunt and under compound
(B) shunt, differential compound and under compound
(C) under compound, shunt and differential compound
(D) shunt, under compound and differential compound