The statute of frauds requires that:

A is incorrect because the statute of frauds requires real estate contracts to be in writing, but not necessarily notarized. Notarization serves to verify identities but isn't a requirement of the statute of frauds itself.

C is incorrect because the statute of frauds requires both parties (buyer and seller) to sign the contract, not just the buyer. Both signatures demonstrate mutual agreement and acceptance of the terms.

D is incorrect because the statute of frauds only requires the contract to be in writing and signed; it doesn't mandate filing with any court. The written contract itself satisfies the requirement.