Which is correct and most complete (according to the chapter)?

a. The paper helicopter example involves four controllable design parameters.

b. People might choose different alternatives because of personal differences.

c. Maximum likelihood estimation can be used in discrete choice modeling.

d. Uncovering the underlying utility surface might help for predicting market share of new products.

e. All of the above are correct.

f. All of the above are correct except

(a) and (e).