What does the following code print val listA = mutableListOf(1 2

What does the following code print val listA = mutableListOf(1 2...

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What does the following code print?

val listA = mutableListOf(1, 2, 3)
val listB = listA.add(4)
print(listB)

A. true

B. [1, 2, 3, 4]

C. Nothing, there is a compile error

D. Unit

Answer: Option A

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