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Question

What is the output of the following?
def to_upper(k):
    k.upper()
x = ['ab', 'cd']
print(list(map(to_upper, x)))

a.

[‘AB’, ‘CD’].

b.

[‘ab’, ‘cd’].

c.

none of the mentioned

d.

error

Answer: (c).none of the mentioned

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Q. What is the output of the following?