Correct Answer: B
App Engine Standard Edition scales very quickly and it is faster than the other solutions because the tech environments are already ready to go.
So, if you are sending batches of requests to your services, for example, to a task queue for processing, a large number of instances will be created quickly. We recommend controlling this by rate limiting the number of requests sent per second, if possible. For example, in an App Engine task queue, you can control the rate at which tasks are pushed.
App Engine also scales instances in reverse when request volumes decrease. This scaling helps ensure that all of your application’s current instances are being used to optimal efficiency and cost effectiveness.
A is wrong because Compute Engine is slower because it has to start new instances.
C is wrong because App Engine Flex is slower because it has to start new containers.
D is wrong because Cloud Functions are slower then App Engine and are not suitable for all the applications
