When two DC generators are operating in parallel, control of load sharing is achieved by

A、carryingoutsystematicload-sheddingprocedures.
B、anequalisingcircuitwhich,inturn,controlsthespeedofthegenerators.
C、thesynchronousbus-bar.
D、anequalisingcircuitwhich,inconjunctionwiththevoltageregulators,variesthefieldexcitationcurrentofthegenerators.