2150. Improper Use of Customers' Securities or Funds; Prohibition Against Guarantees and Sharing in Accounts
(a) Improper Use
No member or person associated with a member shall make improper use of a customer's securities or funds.
(b) Prohibition Against Guarantees
No member or person associated with a member shall guarantee a customer against loss in connection with any securities transaction or in any securities account of such customer.
(c) Sharing in Accounts; Exte