Information required need be given only insofar as it is known or reasonably available to the registrant. If any required information is unknown and not reasonably available to the registrant, either because the obtaining thereof would involve unreasonable effort or expense, or because it rests peculiarly within the knowledge of another person not affiliated with the registrant, the information may be omitted subject to the following conditions:
17 C.F.R. §270.8b-21