Answer: C

This question assesses electronic signatories. If the parties agree to use electronic signatures or data messages for documents, their legal validity shall not be denied simply because they are in the form of electronic signatures or data messages. So option A is wrong. A reliable electronic signature has the same legal effect as a handwritten signature or seal. So option B is wrong. When an electronic signer learns that the electronic signature production data has been or may have been compromised, he shall promptly notify the relevant parties and terminate the use of the electronic signature production data.