Which of these is the best description of a P-value?
A. The probability of making a Type I error.
B. The probability of making a Type II error.
C. The probability of rejecting the null hypothesis if it is, in fact, false.
D. The probability of getting a test statistic at least as extreme as the observed test statistic, if the null hypothesis is true.
E. The probability of getting a test statistic at least as extreme as the observed test statistic, if the null hypothesis is false.