Select the number of stages that will be generated from the DAG while executing the below code?

val rdd1 = sc.textFile("Customer")

val rdd2 = rdd1.map(_.split(",")).map(arr1 => (arr1(2),arr1(4).toInt))

rdd2.cache()

val rdd3 = rdd2.reduceByKey(_ max _)

rdd3.saveAsTextFile("output1")

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