Maryland real estate contracts must be:

A is incorrect because verbal contracts are generally not enforceable for real estate transactions in Maryland. While verbal agreements might be valid in other contexts, the Statute of Frauds requires written documentation for real estate contracts to provide clear evidence of the agreement.

C is incorrect because while witnessing contracts is good practice, Maryland law does not require real estate contracts to be witnessed to be enforceable. The writing requirement is the primary statutory mandate.

D is incorrect because notarization, while adding authenticity and evidentiary value, is not a statutory requirement for enforceable real estate contracts in Maryland. Notarization is typically required for deeds, not the initial contract.