What is the difference between an ‘Invalid Case’ and a ‘Recoverable Case’?

A.
Invalid Case means the case integrity is compromised and must be restored and Recoverable Case means a minor error occurred

B.
both statuses indicate the case is unavailable for processing

C.
recoverable Case means the case is currently being backed up and Invalid Case means case is available for processing

D.
both Invalid Case and Recoverable Case indicate the case is offline