Which changes introduced independently

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
C. bool operator < (const A & b) const {return b.a
D. bool operator < (const A & a, const A & b) {return a.getA()

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