((a)) Accounts held by the debtor for a particular customer in separate capacities shall be treated as accounts of separate customers.
((b)) If a stockbroker or a bank holds a customer net equity claim against the debtor that arose out of a transaction for a customer of such stockbroker or bank, each such customer of such stockbroker or bank shall be treated as a separate customer of the debtor.
((c)) Each trustee’s account specified as such on the debtor’s books, and supported by a trust deed filed with, and qualified as such by, the Internal Revenue Service, and under the Internal Revenue Code of 1986, shall be treated as a separate customer account for each beneficiary under such trustee account.