The following week, Beta purchases 500 units of Type Z prototype from Carrot. Allen quickly sends a price index with discounted prices for its Type Z product, but once again stipulates that an agreement is contingent upon Beta purchasing a minimum of 30,000 units. As a further inducement to agree to purchase the product, Allen ships 250 units to Beta and Beta accepts, with payment at the discounted price. When Beta refuses to accept the second shipment of 250 from Allen, Allen sues for breach of a unilateral agreement between the parties for the purchase by Beta of 30,000 units, which Allen alleges was part performed by Beta. Beta resists, saying that there was no agreement to purchase 30,000 units. Who is right?