C++ MQCs with Explanation ( MANAGING CONSOLE I/O OPERATIONS )

If m and n represent integer values, which of the following statements is legal?

1. cout.write(text, 10);
2. cout.write(text, m);
3. cout.write(text1, m).write (text2, n);
4. All the above

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Answer: 

Option c: cout.write(text1, m).write (text2, n);

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Explanation Here