When are post hoc tests needed?

	A.	When the null hypothesis is accepted, post hoc tests must be performed.
	B.	When the researcher is dissatisfied with the results, post hoc tests must be performed.
	C.	When the p-level is equal to the alpha level, the results are inconclusive and post hoc tests must be performed.
	D.	When the null hypothesis is rejected, post hoc tests must be performed.