Which of the following statements is false?

Question $3$Answer

a$.$

Suppose you want to get the maximum value from an RDD of integers. It is faster to use the reduce function than to sort the values in the RDD in descending order and then return the first value.

b$.$

Using reduceByKey instead of groupByKey can reduce the amount of data shuffled.

c$.$

You need to explicitly invoke a combiner in order to enjoy the benefits of reduced data shuffle when using the reduceByKey function.

d$.$

Writing a query using SparkSQL dataframes will usually run faster than writing the same query using RDDs instead.