Minnesota real estate contracts must be:

Answer A is incorrect because verbal contracts for real estate are generally unenforceable in Minnesota due to the Statute of Frauds. While some contracts can be verbal, real estate agreements require written documentation to be legally binding.

Answer C is incorrect because while notarization adds authenticity to a document, it is not a requirement for real estate contracts to be enforceable in Minnesota. The key requirement is that the contract be in writing.

Answer D is incorrect because witnessing a contract, while sometimes done for additional evidence, is not a legal requirement for enforceability in Minnesota real estate transactions. The Statute of Frauds specifically requires the contract to be in writing.