In the future value models that we covered in the lecture, what must be true about the time periods between interest rate calculations?

Group of answer choices

A) Time periods for compounding must be the same length, e.g., all must be one year, or all must be one month.

B) All time periods for compounding must be annual periods.

C) All time periods for compounding must be monthly periods.

D) The models allow the length of time between interest rate calculations to vary from one period to the next.

which could be the best answer.