To use maximum protection mode, a synchronous redo transport mode must be established with at least one standby database. A snapshot standby database or a logical standby database alone would not meet the requirements because they cannot function in synchronous mode for maximum protection. A far sync instance, however, can receive redo in synchronous mode, thus satisfying the requirements. Therefore, if a logical standby database or a far sync instance is set up correctly, it is possible to change the protection mode to maximum protection. Options that involve different operating systems or the state of flashback are irrelevant to the specific requirements for maximum protection.