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Consider the following statements.

S1 : union of any finite number of countable sets is countable.

S2 : union of infinite number of countable sets is countable 

S3 : cross product of any finite number of countable sets is countable.

S4 : cross product of infinite number of countable sets is countable.

Which of the above statements is TRUE ?

A) Only S1

B) Only S1) and S3)

C) Only S1),S2),S3)

D) All of S1),S2),S3),S4)

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