Outsourcing the Performance of Value Chain Activities Presently Performed In-House

Outsourcing the performance of value chain activities presently performed in-house to outside vendors and suppliers makes strategic sense when

A) an activity can be performed better or more cheaply by outside specialists.
B) it allows a company to focus on its core business and leverage its key resources.
C) outsourcing won't adversely hollow out the company's technical know-how,competencies,or capabilities while it improves organizational flexibility and speeds time to market.
D) it improves organizational flexibility and speeds time to market.
E) All of these.