Which of the following correctly describes the null and alternative hypotheses for an analysis of variance between three treatment groups (µ1, µ2, µ3)?
A. Ho: µ1 = µ2 = µ3, Ha: µ1 ≠ µ2
B. Ho: µ1 = µ2 = µ3, Ha: All means differ
C. Ho: µ1 = µ2, Ha: µ1 ≠ µ2
D. Ho: µ1 = µ2 = µ3, Ha: At least 2 means differ