; and (bb) the nature and duration of the relationship between the affiant and the noncitizen. (XVIII) Any other evidence determined to be credible. (iii) Documents establishing exemption from application fees The Secretary shall set forth, by regulation, the documents that may be used as evidence that a noncitizen’s application for status under section 245B, 245C, 245D, 245E, or 245F is exempt from an application fee under subsection (b)(2). (iv) Authority to prohibit use of certain documents If the Secretary determines, after publication in the Federal Register and an opportunity for public comment, that any document or class of documents does not reliably establish identity, or that any document or class of documents is frequently being used to obtain relief under this section and is being obtained fraudulently to an unacceptable degree, the Secretary may prohibit or restrict the use of such document or class of documents. (G) Sufficiency of the evidence (i) Failure to submit sufficient evidence The Secretary may deny an application under section 245B, 245C, 245D, 245E, or 245F submitted by a noncitizen who fails to submit requested initial evidence, including requested biometric data, or any requested additional evidence, by the date required by the Secretary. (ii) Amended application A noncitizen whose application is denied under clause (i) may, without an additional fee, submit to the Secretary an amended application or supplement the existing application if the amended or supplemented application contains the required information and any fee that was missing from the initial application. (iii) Fulfillment of eligibility requirements Except as provided in clause (i), an application— (I) may not be denied for failure to submit particular evidence; and (II) may only be denied on evidentiary grounds if the evidence submitted is not credible or otherwise fails to establish eligibility. (iv) Authority to determine probity of evidence The Secretary may determine— (I) whether evidence is credible