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)