Which changes, introduced independently, will allow the code to compile and display one eight nine ten? Choose all that

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Which changes, introduced independently, will allow the code to compile and display one eight nine ten? Choose all that apply#include <iostream>#include <map>#include <string>using namespace std;class A {int a;public:A(int a):a(a){}int getA() const { return a;}/* Insert Code Here 1 */};/* Insert Code Here 2 */int main(){int t[] ={ 3, 4, 2, 1, 6, 5, 7, 9, 8, 10 };string s[] = {"three", "four", "two", "one", "six","five", "seven", "nine","eight","ten"}; map<A, string> m;/* Replace Code Here 3 */ for(int i=0; i<10; i++) { m.insert(pair<A,string>(A(t),s));}m.erase(m.lower_bound(2),m.upper_bound(7));map<A, string>::iterator i=m.begin(); /* Replace Code Here 4 */ for( ;i!= m.end(); i++) { cout<<i?>second<<" ";}cout<<endl;return 0;}

A. operator int() const { return a;} inserted at Place 1
B. bool operator < (const A & b) const { return a<b.a;} inserted at Place 1
C. bool operator < (const A & b) const { return b.a<a;} inserted at Place 1
D. struct R { bool operator ()(const A & a, const A & b) { return a.getA()<b.getA();} }; inserted at Place 2 replacing line marked 3 with map<A, string, R> m; replacing line marked 4 with map<A, string,R>::iterator i=m.begin();