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

Which of the following is a valid statement?

1. cout.setf(ios:: internal, ios:: basefield):
2. cout.setf(ios:: scientific, floatfield);
3. cout < <setf(ios:: hex, ios:: basefield)
4. None of the above

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Answer: 

Option b: cout.setf(ios:: scientific, floatfield);

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Explanation Here