Core competencies and competitive capabilities are usually $\_\_\_\_\_\_$

A$.$ lodged in the narrow skills and specialized work efforts of a single department, as opposed to the combined expertise and capabilities of specialists scattered across several departments.

B$.$ observed to stem from collaborative efforts with strategic allies.

C$.$ bundles of skills and know$-$how that most often grow out of the collaborative efforts of cross$-$functional work groups and departments performing complementary activities at different locations in a firm's value chain.

D$.$ found to result in competitive advantage when they involve highly specific technologies and are grounded in a company's own deep technical expertise.