The correct option is VM2 and VM3.

VM2 and VM3 are eligible because they meet the case study constraints for disk encryption. Both VMs use persistent boot and data disks that can be protected with customer managed keys or Google managed keys and they do not rely on local SSDs or other disk types that block standard disk encryption workflows.

VM4 and VM5 is incorrect because those machines do not meet the technical constraints for enabling disk encryption in the case study. One or both of those VMs use disk types or configurations that are not eligible for the required encryption method.

VM1 and VM3 is incorrect because VM1 and VM3 includes VM1 which does not satisfy the encryption prerequisites even though VM3 does. The pair therefore fails the requirement to have both VMs eligible.

VM2 and VM4 is incorrect because VM4 is not eligible under the stated constraints while VM2 is. The combination fails because one member does not support the required disk encryption configuration.

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