(1) Any of the following provisions in an insurance policy, contract of employment, bond, mortgage, promissory note, deposit agreement, pension plan, trust agreement, conveyance, or any other written instrument effective as a contract, gift, conveyance, or trust are considered nontestamentary, and this code does not invalidate the instrument or any provision:

1. (a) that money or other benefits previously due to, controlled, or owned by a decedent shall be paid after his death to a person designated by the decedent in either the instrument or a separate writing, including a will, executed at the same time as the instrument or subsequently;
2. (b) that any money due or to become due under the instrument shall cease to be payable in event of the death of the promisee or the promisor before payment or demand; or
3. (c) that any property which is the subject of the instrument shall pass to a person designated by the decedent in either the instrument or a separate writing, including a will, executed at the same time as the instrument or subsequently.