A brand of water softener salt comes in packages marked net weight 40 lbs. The company that packages the salt claims that the bags contain an average of 40 lb. of salt and that the standard deviation of the weights is2.0 lb. assume that the weights are normally distributed. For samples of size 100, find the standard deviation of the distribution of all possible sample mean weights (i.e., find the standard error of all possible sample mean weights).

A.	20
B.	2
C.	0.20
D.	0.02