Executives at Tastes, an ice cream shop chain, train their staff in such a way that in the absence of employees, there is an individual trained in the same skills which can step in and do the job just as well. The training elements provide employees with details of the skill sets required for different jobs. When applied, results show that this lengthy training program does help the company because they maintain a well-trained and flexible workforce at all times. The executives at Tastes use ________. a. job rotation b. vertical enhancement c. telecommuting d. job sharing