T. Randy, the director of training for a large hospital, has developed a new "Tender, loving care" nurse training program. He plans to measure patient satisfaction in ten wards, and then put nurses from half of the wards through the new program. Four months later he will measure patient satisfaction again. Randy is using the method of training Group of answer choices Supervisor and incumbent opinion Test-retest method Pre-post performance method Pre-post training performance with control group method Post training performance method