Answer:
C. Tiered Workforce
Step-by-step explanation:
Tiered workforce is a hiring strategy that divide your workforce into several different levels. Company could set these levels based on their own criteria, such as loyalty, productivity , or even working hours.
In the example above, The company created different tiers for its workforce based on how long they've worked for the company. The people who already work for the company for enough time is considered to have higher tier than the people who just work for the company. This explain the different salary even when they have the same job.