Correct Answer: D
Option A is incorrect. Local SSD is incorrect because it is a locally attached block storage.
Option B is incorrect. Persistent Disk is incorrect because persistent Disk is block storage for VM on Google Cloud.
Option C is incorrect. Local Cloud Cache is an Invalid option.
Option D is correct. Cloud Storage serves as a Content Delivery Network (CDN) because publicly readable objects are cached in the Cloud Storage network by default.
https://cloud.google.com/local-ssd
https://cloud.google.com/persistent-disk
https://cloud.google.com/storage/docs/caching#built-in_caching_for