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$[$Wrong Deck$]$ Mona hires Jess over the telephone to paint her back deck. She tells him her address and agrees to pay him $$200$ for the job, and he accepts. They enter into the agreement on Tuesday, and he is to paint the deck on Saturday. Jess had a little difficulty finding her house because he spilled coffee on the note where he wrote her address. When Jess arrives, neither Mona nor her neighbor is at home. He mistakenly paints the neighbor's deck. Mona calls him the next day and asks him why he did not paint her deck. He informs her that he did paint the deck. When it is discovered that he mistakenly painted the neighbor's deck, Mona tells him not to worry because the neighbor will be required to pay him. Jess says that if the neighbor does not pay, then he expects all of the payment from Mona, because the contract is executed.

Which statement is true regarding Jess's assertion that Mona must pay him if the neighbor fails to do so$?$

Multiple Choice

He is correct because a valid contract existed; and, after his performance, it is considered executed.

He is incorrect unless he can somehow establish that Mona gave him poor directions or was otherwise at fault in informing him which deck to paint, and the contract remains executory.

He is correct because an implied contract existed, and he made an honest mistake for which Mona must accept the risk.

He is correct because an express contract existed, and he made an honest mistake for which Mona must accept the risk.

He is correct because an implied$-$in$-$law contract existed.