Which of the following is the common theme from the two articles "Creating Project Plans to Focus Product Development" and "Managing Your Innovation Portfolio"?

a$)$

A good innovation strategy requires investing in a portfolio of projects including some that are close to what you do already, others that build or extend your capabilities, and those that could be breakthrough products.

b$)$

A good innovation strategy requires focusing on one category of projects that is a core competence in addition to substantial financial investments.

c$)$

A good innovation strategy allows good ideas to be pursued, regardless of whether they fit the preexisting strategy.

d$)$

Most companies invest in too few innovation projects and therefore cannot gain a competitive advantage.