Company.com moved their application start routines from the inittab and place them under HACMP control. During testing，the applications did not always start as desired.  What is the best practice for the application start routines.（）  

• A、 Assume the system was stopped by a failure.
• B、 Ensure the hostname parameters is set correctly.
• C、 Assume the system was stopped by a graceful shutdown.
• D、 Mount all volumes and file systems before running the application.