How many statements are correct? 0 1 2 3 4

Statement A. The technique of Blocking is indicated when only a random component is present.

Statement B. The technique of Blocking is indicated when only a random and trend component are present.

Statement C. The technique of Blocking is indicated when only a random and seasonal component are present.

Statement D. The technique of Blocking is indicated when only a random, trend, and seasonal component are present.