A Core Competence

A core competence

A) detracts from a company's arsenal of competitive capabilities and competitive assets and is not a resource strength considered to be genuine.
B) is typically results-based, residing in a company's tangible physical assets on the balance sheet.
C) is often grounded in a single department's set of knowledge and expertise.
D) is an activity that a firm performs proficiently that is also central to its strategy and competitive success.
E) is a proficiently performed external activity.