Question: Implement this problem in 4 versions: iterative version, recursive version, tail-recursive version and map filter reduce version in SCALA programming language: Write a function that

Implement this problem in 4 versions: iterative version, recursive version, tail-recursive version and map filter reduce version in SCALA programming language:

Write a function that computes the sum of numbers in a list of lists of numbers:

sumOfSums(List(List(1, 2, 3), List(4, 5, 6)) = 21

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