You're writing a Python application and want your application to run in a sandboxed managed environment with the ability to scale up in seconds to account for h...

You're writing a Python application and want your application to run in a sandboxed managed environment with the ability to scale up in seconds to account for huge spikes in demand.
Which service should you host your application on?

A. Compute Engine B. App Engine Flexible Environment C. Kubernetes Engine D. App Engine Standard Environment