This topic examines some rules of foundation behavior. The foundation shall issue a donation bill according to the facts after actually receiving the donation. Donors do not need to donate bills, or donate anonymously, they should also issue donation bills, which will be kept by the foundation for future reference. Item d error. In order to preserve and increase the value, the foundation shall entrust banks or other financial institutions to make entrusted investments. Item b is correct. The foundation shall not directly publicize, promote or sell the products and brands of the enterprise; Do not provide credit or quality assurance for enterprises and their products. Item c is wrong. The property and other income of the foundation shall be protected by law, and no unit or individual may privately divide, occupy or misappropriate it. Item a is wrong. (Test center: Several Provisions on Foundation Properties)