Choose one drop down answer for each, thanks!

Suppose the population for a study is "employees of a large international corporation". Match the type of sample with what that sample would look like. Stratified sample [ Choose ] Systematic sample [ Choose ] Simple random sample [ Choose ] Cluster sample [ Choose ] [ Choose ] A random number generator selects employees by ID number. Among the eighty-five corporate offices, six are chosen randomly and every employee at each selected office is interviewed. Employees are put in order by date of hire and every 500th employee is chosen. Employees are divided into six salary ranges and each of the six ranges is sampled proportionally