The concept of core competences is key to successful outsourcing strategy. Organisations should:

A: focus on core competences and outsource non-core competences to external firms that can add more value. B: focus on non-core competences in order to drive down the cost of non value adding activities. C: focus on core competences by outsourcing these functions to external firms that can add more value. D: focus on non-core competences by applying transaction cost theory to external firms.