Hmm, let's see... 'hdfs fsck /' - that's the one that makes sure your data is all good, right? I mean, who needs to delete anything when you can just check it's all there!
Ah, the age-old question of checking HDFS data block integrity. Clearly, option A is the way to go - it's the one that actually checks the integrity, not just some report or balancing thing.
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