Sets STL Comparator function

#1

Q8. Sets STL#8
Study the following code carefully.

struct student{
    string name;
    float cgpa;
    student(string name, float cgpa){
        this -> name = name;
        this -> cgpa = cgpa;
    }
};

struct comp{
    bool operator () (const student& x, student y) {
        return x.name < y.name;
    }
};

set < student, comp > batch;
The above code compiles successfully. Choose which of the following declarations of the function operator () will give a compilation error.

#2

When you are sending by reference (by using & operator) to a custom comparator it must be sent with const type. const means that it will become immutable.
bool operator () (student& x, const student& y) will give error as the first parameter is not with a const.

#3

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