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Suppose you have a programmer-defined data type Data and want to overload the << operator
to output your data type to the screen in the form cout << dataToPrint; and allow
cascaded function calls. The first line of the function definition would be
(a) ostream &operator<<(ostream &output, const Data &dataToPrint)
(b) ostream operator<<(ostream &output, const Data &dataToPrint)
(c) ostream &operator<<(const Data &dataToPrint, ostream &output)
(d) ostream operator<<(const Data &dataToPrint, ostream &output)

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Suppose you have a programmer-defined data type Data and want to overload the << operator
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