单选题

执行以下Python语句,得到的结果是?( )

s = {1, 2, 3,4}
s.update({4,5,6})
print(s)

A

{1,2,3,4,4,5,6}

B

{4,5,6}

C

{1,2,3,4,5,6}

D

{1,2,3}

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