4. (2 points) Which of the following TWO statements are true regarding significance level of the test? ( ) A. If p-value is less than significance level, we fail to reject the null B. If p-value is bigger than significance level, we fail to reject the null C. P-value is the probability of observing a statistic that is as extreme as or even more extreme than what you observed when the null hypothesis is true D. P-value is the probability of observing a statistic that is larger than what you observed when the null hypothesis is true