3M leverages its competencies in adhesives technologies to many industries, including automotive, construction, and telecommunications. This is an example of creating value by using

a. unrelated diversification to financial synergies through portfolio management.
b. unrelated diversification to parenting, restructuring, and financial synergies through restructuring and parenting.
c. related diversification to acquire economies of scope by leveraging pooled negotiating power.
d. related diversification to acquire economies of scope by leveraging core competencies.