Suppose you want $10,000 at the end of 4 years. You are evaluating multiple options for investment today.

1. a) Compounding every month at a rate of 9% per year

2. b) Compounding every week at a rate of 8.7% per year

3. c) Compounding every day at a rate of 8.5% per year.

Which of the above options requires least up-front investment? What is that amount?