When Calculating Industry Attractiveness Scores,to Produce a Valid Response It

When calculating industry attractiveness scores,to produce a valid response it is necessary to

A) ensure the appropriate weights are assigned to each measure and that the preparer has sufficient knowledge to rate the industry on each attractiveness measure.
B) ensure the weights are assigned evenly so as not to bias the attractiveness scores.
C) ensure at least three companies within the industry are clearly well-understood to ensure validated scores.
D) be prepared to make an educated guess if the available information is skimpy.
E) All of these.