Which of the following statement about the opportunity cost of capital of an investment is True?

1. a) The opportunity cost of capital is the expected return offered on the market by another project with a comparable riskiness profile.

2. b) The opportunity cost of capital is the expected return required by investors to invest in the project.

3. c) The opportunity cost of capital is the discount rate of the projects expected cash flows that allows you to calculate the price at which the project can be sold or bought on the market.

d) All of the above.