However, facts A, B, and C are never used again; they were instrumental to the argument because they allowed one to establish D, but once D is established, A, B, and C can be safely forgotten.

然而，A,B和C再也没有被使用到；他们只是辅助性的证明，因为它们被用来建立D，然而一旦D被建立起来后，A,B,C可以被毫无顾虑地忘掉。

youdao

An A is worth four points, a B three points, a C two points and a D one point.

VOA: special.2009.03.05

So in summary, I believe that type B, C, D players will kill your company, but there is no way I can only limit that to one position inside a company.

FORBES: Project Managers Will Kill Your Company: Advice From Palo Alto Networks Founder Nir Zuk