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Your networking team enabled Cloud CDN for an external-facing service exposed through an external Application Load Balancer. The application team has configured cacheable content in the responses, but performance testing shows no improvement after enabling Cloud CDN. How should you troubleshoot and resolve this issue?
A
Configure the CACHE_ALL_STATIC caching mode on Cloud CDN to ensure Cloud CDN caches all static content as well as content defined by the backends.
B
Configure the FORCE_CACHE_ALL caching mode on Cloud CDN to ensure all appropriate content is cached.
C
Configure the USE_ORIGIN_HEADERS caching mode on Cloud CDN to ensure Cloud CDN caches content depending on responses to requests from the backends.
D
Configure the CACHE_ALL_STATIC caching mode on Cloud CDN to ensure Cloud CDN cache content depending on responses to requests from the backends.