Which architecture should you use?

Topic 2, Misc. Questions

You are building a new API. You want to minimize the cost of storing and reduce the latency of serving images.

Which architecture should you use?
A . App Engine backed by Cloud Storage
B . Compute Engine backed by Persistent Disk
C . Transfer Appliance backed by Cloud Filestore
D . Cloud Content Delivery Network (CDN) backed by Cloud Storage

Answer: D