Which of the following can be described as involving direct finance?

Select one:

a$.$

A corporation$$s stock is traded in an over$-$the$-$counter market.

b$.$

A corporation buys commercial paper issued by another corporation.

c$.$

A pension fund manager buys commercial paper from the issuing corporation.

d$.$

Both $($B$)$ and $($C$)$ of the above.