Which is correct and most complete?

a. If you only have enough money for a few runs, using screening without RSM might be wise.

b. In general, factors in a DOE must be uncontrollable during experimentation.

c. Adjusted R2 is not relevant for evaluating whether data are reliable.

d. The number of runs in RSM increases linearly in the number of factors.

e. All of the above are correct.

f. All of the above are correct except

(a) and (e).