just , effective , and well understood rules are often not good enough for what is required as guides to performance on the job because they cannot cover all situations. this statement means . a. work rules cannot be very useful guidelines for job performance because they will be forgotten in emergencies. b. effective work rules are good work performance guides for workers who understand them. c rule cannot be effective gives to work on the job because everyone can understand them. d. work rules are inadequate guides to job performance because they don't fit every situation