What is the correct description of the Loader job in Fusionlnsight HD?

What is the correct description of the Loader job in Fusionlnsight HD?
A . After the Loader submits the job to YARN for execution, if the Loade transaction is abnormal at this time, the job execution fails.
B . After the Loader submits the job to YARN for execution, if a Mapper task fails to execute, it can automatically retry
C . After the Loadet job fails to execute, garbage data will be generated, which needs to be manually cleared by the user
D . After the Loader submits a job to YARN for execution, no other jobs can be submitted until the job is completed.

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Answer: B