Which of the following is true of long-term funds?

a. They are a type of investment fund which invests in money market investments of high quality and low risk.

b. They provide an easy way to reduce financing costs because they are relatively cheaper than short-term funds.

c. They are the funds available to a business on the basis of inventory held and require detailed inventory tracking.

d. They are the sources that supply the financing necessary to support a firm's capital budgeting activities.

I'm saying d.

Note: I already know that answer b. is wrong.