Which is correct and most complete based on the above table?

a. Changing factor x2 over the levels in the experiment can be proven to make a significant difference with IER and α = 0.05.

b. In standard screening, a new set of test prototypes is needed for each response.

c. Changes in different factors can have significant effects on different responses.

d. All of the above are correct.

e. All of the above are correct except

(a) and (d).