With respect to premiums paid by employers to the WSIB for the insurance system, which of a, b and c is false, or is d corn premiums are based on the health and safety record of all employers with the same type of business an individual employer may pay a surcharge or receive a rebate if their health and safety record is worse or better than that of other employers that have the same type of business when a pre-existing condition contributes to a worker-related accident an employer may apply for those costs not to be attributed to their health and safety record all of the above are true