At a dinner party, on September 25th (this year), Declan said to Hillary, "If you redesign my company's website and complete the project no later than November 1st (this year), I offer to pay you $1,500." Hillary immediately said, "I accept!" Hillary began the website redesign on September 28th. On Sept. 30th, when Hillary had only completed about 2% of the final project, Declan called Hillary and said, "The deal is off. I am revoking my offer." (Assume completing 2% of the project is not "substantial performance.") However, Hillary ignored Declan's revocation attempt and completed the website redesign on October 10th. Assuming these events occur in a jurisdiction that follows the rules for offer/acceptance/revocation used in the MAJORITY of states, consider these events and choose the answer below that is most correct:

The parties formed a valid BILATERAL contract on Sept. 25th;

The parties formed a valid UNILATERAL contract on Sept. 28th;

The parties formed a valid UNILATERAL contract on Oct. 10th;

The parties NEVER formed a valid contract because Declan validly revoked the offer before Hillary validly accepted;

The parties formed a valid UNILATERAL contract on Sept. 25th;