Jim Is a Manager at a Local Retail Store

Jim is a manager at a local retail store.Currently his employees receive pay checks weekly.Jim is thinking about changing this to bi weekly pay checks,and incorporating quarterly bonuses based on commission.If he proceeds,Jim would be making what kind of changes?

A) Continuing fixed interval schedule and starting fixed ratio schedule
B) Stopping fixed interval schedule and starting fixed ratio schedule
C) Continuing fixed interval schedule and starting variable ratio schedule
D) Stopping variable interval schedule and starting fixed ratio schedule