Answer will be B, only as union and cross product of countable sets is always countable.

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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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