Your company's test suite is a custom C++ application that runs tests throughout each day on Linux virtual machines. The full test suite takes several hours to complete, running on a limited number of on-premises servers reserved for testing. Your company wants to move the testing infrastructure to the cloud, to reduce the amount of time it takes to fully test a change to the system, while changing the tests as little as possible.
Which cloud infrastructure should you recommend?

A. Google Compute Engine unmanaged instance groups and Network Load Balancer B. Google Compute Engine managed instance groups with auto-scaling C. Google Cloud Dataproc to run Apache Hadoop jobs to process each test D. Google App Engine with Google StackDriver for logging