Which three statements are true regarding persistent lightweight jobs？（）
- A Persistent lightweight jobs modify several tables in the data dictionary to generate a lot of redo.
- B The user cannot set privileges on persistent lightweight jobs.
- C Persistent lightweight jobs are useful when users need to create a large number of jobs in a short time.
- D Persistent lightweight jobs are useful when users need to create a small number of jobs that run infrequently.
- E The use of a template is mandatory to create persistent lightweight jobs.