Product service life is determined by a. estimates b. market forces c. liability d. property tests e. failure analysis f. all of the above

Answer: d) property tests

Explanation: Product service life can be referred as the life that define the service that can be provided by the product manufactured. The service life contains the testing and calculation of the product's quality, reliability, maintenance factor etc. These factors are known as the property of the product and so is calculated by the property test. Therefore option (d) is the correct option because other option does not define the factors for defining the product service life.