For a Resource to Provide a Firm with the Potential

For a resource to provide a firm with the potential for a sustainable competitive advantage, it must have the following four attributes

A) Rare, valuable, mobile, and nonsubstitutable.
B) Rare, inimitable, physically unique, and nonsubstitutable.
C) Rare, valuable, inimitable, and nonsubstitutable.
D) Rare, valuable, physically unique, and causally ambiguous.