Suppose you are a salesperson responsible for making cold calls to potential clients. Your manager reviews your performance at random times during the day, providing bonuses when they observe high$-$quality pitches or successful interactions. Sometimes your manager might review your calls after $20$ minutes, other times after an hour. This is an example of a $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ schedule

Question $22$Select one:

a$.$

variable ratio

b$.$

fixed variable

c$.$

fixed ratio

d$.$

variable interval