Which of the following must be included when a notary's preferred signature is not legible?

When a notary's preferred signature is not legible, it is essential for them to legibly print their name adjacent to the signature. This practice ensures clarity and helps to confirm the notary's identity and the validity of the notarization. By clearly writing their name next to an unclear signature, the notary provides a direct reference to their official identity, which is crucial for the integrity of the notarization process.

While stamps of approval or different signature styles might enhance the documentation, they do not fulfill the requirement for clarity and identification like legibly printing the name does. Similarly, the use of a digital signature, while accepted in certain contexts, does not address the issue of a legible physical signature. The key purpose of printing the name is to mitigate any confusion or uncertainty regarding the notary’s identity and the authenticity of the notarial act, thus ensuring the document's validity.