Which two events may have occurred?

Results catching has been configured on a business service. A previously cached result has been flushed from the cache.
Which two events may have occurred?
A. Result catching has been disabled for the business service.
B. The WSDL resource for the business service has been updated.
C. The back-end service referenced by the endpoint URI has become unavailable.
D. The back-end service has returned a different response for the cache key.

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