The correct answer is A because App Engine is a regional resource, meaning it must be redeployed to a different region to change its location. According to GCP documentation, once an App Engine's region is set, it cannot be modified. Options B, C, and D are incorrect as they suggest methods to change the region that are not supported by App Engine's regional resource model. Selecting a region near your users can help meet latency, availability, or durability requirements, but it's important to consider the locations of other GCP services your app uses, as cross-location services can impact latency and pricing.