Final answer:
Deploying virtual machines across multiple availability zones can ensure they remain accessible if a single data center fails, as availability zones are distinct locations insulated from each other's failures.
Step-by-step explanation:
If a company wants to ensure that their virtual machines (VMs) remain accessible even in the event of a data center going down, deploying VMs across multiple availability zones is an excellent strategy. Availability zones are distinct locations within a cloud provider's region designed to be insulated from failures of other zones. By distributing VMs across these zones, you create a robust and resilient infrastructure that can withstand the loss of a single data center due to connectivity issues, power outages, natural disasters, or other disruptions. This is because other zones can continue to operate and handle the workload if one zone becomes unavailable.