Which of the following is true under common law in regard to a counteroffer?

Group of answer choices

a) The result is the same as that under the UCC in that if the parties are both merchants, the terms under some circumstances may become part of the contract.

b) The effect of the counteroffer is that the original offer is no longer valid, and the offeree of the counteroffer becomes the offeror as to the counteroffer.

c) The counteroffer has no effect, and the original offer remains open until it expires under its own terms.

d) The original offer is void, but the counteroffer may be accepted so long as it is done within 24 hours.

e) The original offer remains open, and the counteroffer also remains open; but the counteroffer must be accepted within 24 hours.