Which Definition of Customer Success Is True

Which definition of customer success is true?

A) It is the business methodology of ensuring that customers achieve their expected and unexpected outcomes while using your product or service.
B) It is a business methodology for increasing recurring revenues by minimizing the risk of churn while driving adoption and expansion.
C) It is the business methodology of ensuring that customers are always on the latest software releases and subscription contracts so that they can focus on the core business activities that make them successful.
D) It is a measure of the Net Promoter Score that results from a disciplined engagement of sales, services, marketing, and customer success teams working seamlessly to deliver a positive experience for the customer.