; (ii) the gift will be used only in furtherance of a research and development plan established under subsection (c)(1); (iii) the gift is accepted in compliance with the guidance promulgated under subsection (c)(2); and (iv) using a standard contract or other transaction to acquire the gift is either not feasible or not appropriate. (C) Limitations The Commission may not accept a gift if— (i) conditions inconsistent with applicable laws or regulations apply to the gift; or (ii) the gift is conditioned on, or will require, the expenditure of appropriated funds not available to the Commission. (D) Sunset The authority provided by subparagraph (A) may not be exercised on or after October 1, 2024. (c) Research and development plan; guidance Before using the means authorized in subsection (b), the Commission shall— (1) approve a research and development plan that furthers the goals of this section, by establishing— (A) the potential areas of interest to the Commission; (B) the potential activities the Commission may undertake to investigate the potential areas of interest; and (C) a general explanation of how the means will assist the Commission in understanding the potential areas of interest; and (2) promulgate guidance on the appropriate use of the means in order to— (A) prohibit the Commission or Commission staff from accepting or soliciting gifts, or engaging in other transactions, which would unduly restrict or interfere with the work of the Commission; (B) prevent the endorsement or the appearance of the endorsement by the Commission or Commission staff of the products, services, activities, or policies of a donor or contractor