What should you do?

You support a stateless web-based API that is deployed on a single Compute Engine instance in the europe-west2-a zone. The Service Level Indicator (SLI) for service availability is below the specified Service Level Objective (SLO). A postmortem has revealed that requests to the API regularly time out. The time outs are due to the API having a high number of requests and running out memory. You want to improve service availability.

What should you do?
A . Change the specified SLO to match the measured SLI.
B . Move the service to higher-specification compute instances with more memory.
C . Set up additional service instances in other zones and load balance the traffic between all instances.
D . Set up additional service instances in other zones and use them as a failover in case the primary instance is unavailable.

Answer: C