Final answer:
Azure Active Directory Premium P2 guarantees at least 99.9 percent availability, known as 'three nines,' ensuring high reliability and minimal service downtime.
Step-by-step explanation:
In Azure Active Directory Premium P2, at least 99.9 percent availability is guaranteed. This level of service availability is often referred to in the industry as "three nines." It ensures that the service is highly reliable and available, with minimal downtime. The availability guarantees are part of the Service Level Agreement (SLA) provided by Microsoft Azure to its customers. An availability of 99.9% translates to a maximum of around 8.76 hours of downtime per year, significantly less than lower availability percentages which would result in more potential downtime.