As updates to an online order entry system are processed, the updates are recorded on a transaction tape and a hard copy transaction log. At the end of the day, the order entry files are backed up on tape. During the backup procedure, a drive malfunctions and the order entry files are lost. Which of the following is necessary to restore these files? 
A、The previous day's backup file and the current transaction tape 
B、The previous day's transaction file and the current transaction tape 
C、The current transaction tape and the current hard copy transaction log 
D、The current hard copy transaction log and the previous day's transaction file