What are the different ways that emitter permits can be issued by the government? (check all that apply) A) Permits can be auctioned off to the highest bidders which tend to be power companies with the lowest marginal costs to reduce their CO2 emissions B) Permits can be given away for free, and the power companies can sell them to others C) Permits can be issued using a foreign currency, and buyers can exchange those permits in a different currency that is worth more than the original value of the permit. D) Permits can be auctioned off to the highest bidders which tend to be power companies with the highest marginal costs to reduce their CO2 emissions