Your company has a set of compute engine instances that would be hosting production-based applications. These applications would be running 24x7 throughout the year. You need to implement the cost-effective, scalable and high availability solution even if a zone fails. How would you design the solution?

A. Use Managed instance groups with preemptible instances across multiple zones B. Use Managed instance groups across multiple zones C. Use managed instance groups with instances in a single zone D. Use Unmanaged instance groups across multiple zones