You have created a script in the recovery catalog called backup_database. Which of the following commands would successfully execute that script？（）  

• A、 run { open script backup_database； run script backup_database }
• B、 run { engage script backup_database； }
• C、 run { run script backup_database； }
• D、 Run { execute script backup_database； }
• E、 The name backup_database is an invalid name for an RMAN script. Trying to run it from RMAN would result in an error.