; (B) if consistent with the national security, authorize exceptions to or waivers of national security investigative requirements, and may issue implementing or clarifying guidance as necessary; (C) assign, in whole or in part, to the head of any agency (solely or jointly) any of the duties of the Security Executive Agent under paragraph (2) or the authorities in subparagraphs (A) and (B) of this paragraph, with the agency's exercise of such assigned duties or authorities to be subject to the Security Executive Agent's oversight and with such terms and conditions (including approval by the Security Executive Agent) as the Security Executive Agent determines appropriate