which of the following helps azure maintain high availability and fault tolerance

Question

1. Availibility sets 
2. Failover cluster
3. Replica set
4. scale set
5. IP address  

Answer 1

The correct answer is 1 - Availability sets. 

A single availability set may be used to configure a bunch of Virtual machines for redundancy. Each application tier may also be configured as an availability set or it may be combined with a load balancer. 

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