(a)Signature required. Each piece of correspondence that requires a signature must bear: (1) A handwritten signature personally signed in permanent ink by the person named as the signatory, or a true copy thereof; or (2) An electronic signature that meets the requirements of paragraph (c) of this section, personally entered by the person named as the signatory. The Office will accept an electronic signature that meets the requirements of paragraph (c) of this section on correspondence filed on paper