Would it pay a seller to use group price discrimination and nonlinear price discrimination at the sametime? Can you think of someexamples?

Relative to no price discrimination(or using only group price discrimination or only nonlinear pricediscrimination), simultaneously using group price discrimination and nonlinear price discrimination

A.

could be illegal.

B.

would eliminate deadweight loss.

C.

would decrease producer surplus.

D.

could increase profit.