A company's supply chain manager thinks there are no advantages to using providers from different parts of the world. Which of the following is more appropriate for using different countries for manufacturing?

a$.$

The proliferation of global information systems created the necessity of using worldwide services.

b$.$

It is a temporary trend, but using it might attract investors to the company.

c$.$

Different countries might have specialized manufacturers.

d$.$

It is only worth it if there is cheap labor.