What is the definition of "high availability" in the context of service architecture components?

What is the definition of "high availability" in the context of service architecture components?
A . The ability of a system to handle an increasing number of users
B . The capability of a system to recover from failures and continue functioning
C . The practice of running multiple instances of a service to balance the load
D . The process of ensuring that all data is consistently backed up

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Answer: B