Whether a Resource or Capability Can Support a Competitive Advantage

Whether a resource or capability can support a competitive advantage is determined by which two tests?

A) Whether the resource or capability is competitively valuable and/or is something that rivals lack.
B) Whether the resource or capability is rare and/or is hard to copy.
C) Whether the resource or capability can be trumped and/or is hard to copy.
D) Whether the resource or capability is competitively valuable and/or are there good substitutes available for the resource.
E) Whether the resource or capability is hard to copy and/or can be trumped by different types of resources and capabilities.