When an individual signs a document by mark (e.g., 'X'), what is the strict role of the two required witnesses regarding the notary's sequential journal?

They must both sign the journal next to the signer's mark.

They must both provide their right thumbprints in the journal.

Only the witness who writes the signer's name next to the mark must sign the journal.

They are not required to sign the journal unless they are ALSO acting as credible witnesses to establish the signer's identity.