Select the One Best Answer from the Following

Multiple Choice

Select the one best answer from the following:

A) demand fluctuations that depend on the time of the year, week or day are called seasonality
B) The seasonal index is an estimate of how much the demand during the season will be above or below the average demand
C) seasonality ALWAYS occurs in summer, winter, spring and fall
D) a and b are true
E) b and c are true