In Engineering Economics, which among these is/are true about a discount? A. It is the difference between the future and present worth values. B. Its discount rate will never be equal to the interest...

In Engineering Economics, which among these is/are true about a discount?
A. It is the difference between the future and present worth values.
B. Its discount rate will never be equal to the interest rate.
C. It is a year-end payment paid at the beginning.
D. It is the interest paid for every year-end payment.