【单选题】
A Proprietary knowledge may be difficult to adopt, replicate or transfer since it is often undocumented专有知识可能很难采?,复制或转移,因为它往往是?证
B Public frameworks are always cheaper to adopt 采?公共框架总是更便宜
C Public frameworks are prescriptive and tell you exactly what to do公共框架是指令性的,并准确地告诉你该怎么做
D Proprietary knowledge has been tested in a wide range of environments专有知识已在各种环境中进?了测试
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