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To improve the cache hit ratio for your company's logo image file served through Cloud CDN across multiple hosted websites, what steps should you take?
A
Configure custom cache keys for the backend service that holds the image file, and clear the Host and Protocol checkboxes.
B
Configure the default time to live (TTL) as 0 for the image file.
C
Configure versioned URLs for each domain to serve users the image file before the cache entry expires.
D
Configure Cloud Storage as a custom origin backend to host the image file, and select multi-region as the location type.
