“昔穆公求士，西取由于于戎”，……客何负与秦哉？”

前后两部分构成怎样的关系？从这里可以看出这段文字整体上采用了什么论证方法？

Which statement is TRUE（）.

A.Key letters or abbreviations may not be used in GMDSS radio logbooks under any circumstance

B.Urgent communications do not need to be entered in the GMDSS radio log

C.Both of the above

D.None of the above