Primary difference between rebates and coupons?

1. Coupons allow individuals to sort themselves into the high-elasticity group after the sale

2. Neither couples or rebates are redeemed in high numbers

3. Rebates allow individuals to sort themselves into the high-elasticity group after the sale

4. Coupons are legal and rebates are illegal

In the long run a monopolistic competitor

1. set MR = MC

2. produces where P=AC

3. sets P>MC

4. All the above