Those who successfully complete the training program are placed at stations as probationary firefighters for the remainder of the one year probationary period. Which is the BEST meaning for the probationary as it is used in the above sentence? A) a period in which additional training will occur B) a waiting period in which a new firefighter undergoes several interviews C) a trial period in which candidates are potentially hired but not guaranteed a job D) a guaranteed time period in which the new firefighter will be paid a starting salary