A developer is making the ModifyDDInstanceSpec API call to change the specifications of an RDS instance, but the operation fails. Why could this be? (Number of correct answers: 3)
Haha, A is such a silly answer. Of course you can't modify an instance that's already running, that would be like trying to change the tires on a moving car!
I agree, B and C are the correct answers. D sounds like a trick question - you shouldn't be able to modify a disaster recovery instance in the first place.
B and C seem the most likely reasons. You can't modify an instance that's already running, and you also can't modify one that's in the middle of a backup task.
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