What are the rules for Stems-and-Branches combination？

What are the rules for Stems-and-Branches combination？

A.Yang Stem with Yang Branch.

B.Yin Stem with Yang Branch.

C.Yin Stem with Yin Branch.

D.Yang Stem with Yin Branch.

正确答案：Yang Stem with Yang Branch.Yin Stem with Yin Branch.