Three scenarios are given in parts a through c below. for each scenario, determine the sampling method used by the managers. a) the managers select a single branch at random and survey every employee of that branch. a. the managers used a systematic sample. b. the managers used a multistage sample. c. the managers used a cluster sample. d. the managers used a stratified sample. e. the managers used a simple random sample. b) the managers use the company e-mail directory to contact every 3030th employee on the list. choose the correct sampling method below. a. the managers used a cluster sample. b. the managers used a multistage sample. c. the managers used a stratified sample. d. the managers used a systematic sample. e. the managers used a simple random sample. c) the managers split the company into divisions, with each division containing employees that have similar jobs. within each division, they select a srs of employees to contact. choose the correct sampling method below. a. the managers used a stratified sample. b. the managers used a cluster sample. c. the managers used a simple random sample.