A homeowner enters into a contract to sell her home to a potential buyer for $500,000. The potential buyer provides additional consideration and, in exchange, the homeowner agrees not to revoke her offer while the potential buyer obtains the necessary financing for the purchase. This is an example of a(n) . . .

Group of answer choices:

a.Firm offer under the UCC

b.Rejection under the mirror image rule

c.Void contract under the doctrine of illegality

d.Options contract under the common law