You have a SQL Server 2012 database named DB1. You have a backup device named Device1. You discover that the log file for the database is full. You need to ensure that DB1 can complete transactions. The solution must not affect the chain of log sequence numbers (LSNs). Which code segment should you execute?
A. BACKUP LOG DB1 TO Device1 WITH COPY_ONLY
B. BACKUP LOG DB1 TO Device1 WITH NORECOVERY
C. BACKUP LOG DB1 TO Device1 WITH TRUNCATE_ONLY
D. BACKUP LOG DB1 TO Device1