Which changes introduced independently will allow code to compile and display 0 18 9 (choose all that apply)
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. bool operator < (const A & a, const A & b) {return a.getA()<b.getA();} inserted at Place 2
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