Gene Craft Inc. is the market leader in the pharmaceutical industry. Though most of its resources are common to those of its competitors, a few rare resources have helped the company gain and sustain a competitive advantage. Which of the following assets of Gene Craft Inc. is most likely to be considered a rare resource that is best contributing to its competitive advantage?

a$.$

the company's plant and machinery

b$.$

the company's land and buildings

c$.$

the company's chemical patents

d$.$

Let me guess the answer