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.