Project's A and $B$ both have risk$-$free cash flows and you wish to evaluate which one of the two mutually exclusive projects should be chosen. Which of the following statements are true regarding why you cannot simply compare the IRR of A with the IRR of B and choose the project with the higher IRR?

Multi$-$select; choose all the true answers.

A$)$ It may be desirable to earn a lower return on a longer$-$term project than a higher return on a shorter$-$term project.

B$)$ For unconventional projects, a lower IRR is desirable.

C$)$ Neither project may have an IRR greater than the opportunity cost of capital.

D$)$ It may be desirable to earn a lower return on a larger project than a higher return on a smaller project.