We can use present value and future value for many calculations, but most often we use them to determine?

A$)$ Present Value $=$ Discount Rate: Future Value $=$ Growth Rate

B$)$ Present Value $=$ Growth Rate: Future Value $=$ Discount Rate

C$)$ Present Value $=$ how much was spent on my b$-$day gifts: Future value $=$ what I can sell them for on eBay

D$)$ D$.$ All of the above