Why are public frameworks, such as 1TIL, attractive when compared to proprietary knowledge?

A.
Proprietary knowledge may be difficult to adopt, replicate or transfer since it is often
undocumented
B.
Public frameworks are always cheaper to adopt
C.
Public frameworks are prescriptive and tell you exactly what to do
D.
Proprietary knowledge has been tested in a wide range of environments
This question found in my exam @ March -2015
Were all questions form this pool please?
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