1. Ed advertises a reward for the return of his lost dog. Flo, who does not know of the reward, finds and returns the dog. Is Flo entitled to the reward?

1. Yes, because a unilateral contract has been formed.
2. Yes, because a bilateral contract has been formed.
3. No, because Flo did not know about the reward.
4. No, because all contracts must be in writing.