Information from observers should be used as a supplement to information from incumbents. Identify the statement that is most likely to support this argument. a. Incumbents are a logical source of information; however, they may not be able to provide precise information. b. Incumbents provide accurate estimates of the importance of job duties, whereas supervisors provide accurate information about the time spent on safety-related risk factors. c. Incumbents provide accurate information, but they may have an incentive to exaggerate what they do to appear more valuable to the organization. d. Depending on external job analysts to supplement incumbents' information could be risky due to the relative inexperience of the analysts involved. e. Information provided by observers who look for a match between what incumbents are doing and what they are supposed to do may be unreliable.