THESE ARE THE FILES THAT MAKE UP A DATABASE, AND MUST ALL BE SYNCHRONIZED BEFORE IT CAN BE OPENED

2. þ A. These are the files that make up a database, and must all be synchronized before it can be opened.ý B, C, and D. B is wrong because these files are not, strictly speaking, part of the database at all. C is wrong because an error with the controlfile will mean the database cannot even be mounted, never mind opened. E is wrong because SMON can only fix problems in datafiles, not anything else.