Which of the following is NOT a requirement for a valid deed?

In the context of real estate transactions, a valid deed must meet specific legal requirements to be enforceable. Among these requirements, notarization, a written statement, and delivery of property are essential components.

Notarization provides an official verification of the identities of the parties involved and ensures that the signing of the deed is done voluntarily and without coercion. A written statement is necessary as deeds must be in writing to be considered valid under the Statute of Frauds. Delivery of property involves the transfer of possession from the grantor to the grantee, which is crucial for the deed to take effect legally.

The signature of witnesses is not universally required for a deed to be deemed valid. While some jurisdictions or certain types of deeds may require witnesses for additional assurances or specific legal contexts, it is not a blanket requirement across all states, including Texas. Therefore, the absence of signature by witnesses does not invalidate the deed, making this the correct answer.