You are developing a marquee stateless web application that will run on Google Cloud. The rate of the incoming user traffic is expected to be unpredictable, with no traffic on some days and large spikes on other days. You need the application to automatically scale up and down, and you need to minimize the cost associated with running the application. What should you do?

A. Build the application in Python with Firestore as the database. Deploy the application to Cloud Run. B. Build the application in C# with Firestore as the database. Deploy the application to App Engine flexible environment. C. Build the application in Python with CloudSQL as the database. Deploy the application to App Engine standard environment. D. Build the application in Python with Firestore as the database. Deploy the application to a Compute Engine managed instance group with autoscaling.