$1$ For the scenario, determine if the contractual agreement is valid and what is $"$at play" related to agreement between parties.

Rusty is a landlord over the apartment Pierre lives in$.$ Pierre is unable to make rent payments, so Rusty makes Pierre do renovation labor on the apartments every day for $6$ hours as payment instead. He also makes Pierre sign a contract that he will not move until he catches up to his late payments.

Valid

Not valid $-$ Fraud in the execution

Not valid $-$ Undue influence

Not valid $-$ Duress