Which of the following is a false statement?

1.Parties can form a contract without putting the terms in writing.

2.An executed contract is one that has been fully performed by all the parties to the contract.

3.A voidable contract is a valid contract but one that can still be disaffirmed and avoided by at least one of the parties to it.

4.A quasi-contract has no legal efficacy since it is a "pretend" contract.