DAX can only be used on one volume and the volume has to be NTFS. You could configure DAX on Volume1 (although that would require reformatting the volume) or Volume3. However, 'Volume1 only' isn't an answer option so Volume3 is the correct answer.
'Volume1 and Volume3' is incorrect because of the single volume limitation.
Reference:
https://docs.microsoft.com/en-us/windows-server/storage/storage-spaces/persistent-memory-direct-access