Churn rate is $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.$

Question $12$ Select one:

a$.$

The percentage they spend at a business for a certain type of service.

b$.$

The value of a customer over the time they spend on that business

c$.$

the handling of cash in a service business

d$.$

the rate of return on an investment

e$.$

the percentage of subscribers who discontinue their subscriptions in a year