A researcher helping with the study informed the team that job productivity may be influenced by job type. For instance, individuals who must answer the phone during work hours may have lower job productivity compared to individuals who do not answer the phone during work hours. Thus, the researcher recommended that the study be conducted by separating the random sample of 200 employees into two groups based on job type (those who answer the phone vs those who do not answer the phone). Then for each job type group, randomly assign some individuals to use a traditional desk chair and randomly assign others to use a large exercise ball as their desk chair. At the end of the study, comparisons of job productivity between the treatments will be done separately for the job type groups. What type of experimental design is used in this new study? A. Completely Randomized B. Matched Pairs C. Randomzied Comparative D. Observational Study E. Randomized Block