If a company is considering a project that would utilize a previously purchased piece of equipment, then the original cost of the equipment is:

a -an opportunity cost the firm should charge against the project.

b -an opportunity cost that is irrelevant in the analysis of the project.

c -a sunk cost the firm should charge against the project.

d -a sunk cost that is irrelevant in the analysis of the project.

e -None of the above.