Following an overhaul of a crosshead type diesel engine, the engine is jacked over with th

Following an overhaul of a crosshead type diesel engine, the engine is jacked over with the turning gear as part of the pre-start procedure, which of the listed pre-start procedures should be carried out？

A.Ensure proper cylinder lube oil flow

B.Open all air space drain cocks

C.Open all indicator valves

D.all of the above

请帮忙给出正确答案和分析，谢谢！