Question: What needs to be added to the code to create a new RDD with the number of words in each line of the file? rdd

What needs to be added to the code to create a new RDD with the number of words in each line of the file?
rdd = sc.textFile("file.txt")
new_rdd = rdd._____(lambda x: len(x.split()))
A.
filter()
B.
reduce()
C.
flatMap()
D.
map()

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