You have a storage bucket that contains the following objects: [1] [1] [1] [1] Cloud CDN is enabled on the storage bucke

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You have a storage bucket that contains the following objects:
[1]
[1]
[1]
[1]
Cloud CDN is enabled on the storage bucket, and all four objects have been successfully cached. You want to remove the cached copies of all the objects with the prefix folder-a, using the minimum number of commands.
What should you do?

A. Add an appropriate lifecycle rule on the storage bucket.
B. Issue a cache invalidation command with pattern /folder-a/*.
C. Make sure that all the objects with prefix folder-a are not shared publicly.
D. Disable Cloud CDN on the storage bucket. Wait 90 seconds. Re-enable Cloud CDN on the storage bucket.