James has a requirement not to use an RDD over and over again and need to persist it for batch operations for later purpose. What is the syntax/code shall be used by him?
rdd.persist(StorageLevel.MEMORY_ONLY)
rdd.persist(StorageLevel.MEMORY_AND_DISK)
rdd.persist(StorageLevel.MEMORY_AND_DISK_SER)
rdd.save(StorageLevel.MEMORY_DISKMEMORY)
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