When should you use incremental PI and incremental IRR?

Group of answer choices

When choosing between identically sized, mutually exclusive projects.

When there are negative future cash flows for a project.

When the firm is capital rationing.

When projects are of different size.

Group of answer choices

$-0\mathrm{.}0588$

$-0\mathrm{.}435$

$4\mathrm{.}8235\%$

$-$$$500\mathrm{.}00$