C++ MQCs with Explanation ( WORKING WITH FILES)

Which of the following statements is TRUE?

1. Member functions of a template class defined outside the class need not be defined as function templates
2. In class templates with multiple arguments, all the arguments need not be of class T type arguments
3. Template functions can not be overloaded
4. All the above

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Answer: 

Option a: Member functions of a template class defined outside the class need not be defined as function templates

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Explanation Here