Containers, Inc., sends its standard order form to Distribution Corporation to evidence a sale of packing materials. Distribution responds with its own standard purchase order form. Additional terms in the purchase order automatically become part of the contract unless

a$.$the terms materially alter the original contract.

b$.$the offeror objects to the new terms within a reasonable time.

c$.$the original offer expressly required acceptance of its terms.

d$.$any of the choices.