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When a team of data engineers is testing a stream-stream join in Spark, which of the following statements accurately describes these types of joins?
A
A stream-stream join is not supported in Spark.
B
A stream-stream join can only be performed in Scala.
C
Adding a watermark is necessary for a stream-stream outer join.
D
A stream-stream join is supported in Spark only if one of the streams has Kafka as its source.
E
A stream-stream join cannot be an outer join.