Assume that projects Alpha and Beta are mutually exclusive. Which of the following statements is true regarding the investment decision tools' suitability for deciding between projects Alpha & Beta?

A、TheincrementalIRRshouldnotbeusedsincetheprojectshavedifferentlives;
B、TheincrementalIRRshouldnotbeusedsincetheprojectshavedifferentdiscountrates;
C、TheincrementalIRRshouldnotbeusedsincetheprojectshavedifferentcashflowpatterns.;
D、BoththeNPVandincrementalIRRapproachesareappropriatetosolvethisproblem.