Which changes introduced independently will allow the code to compile and display 0 0 1 1 8 8 9 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. struct R {bool operator ()(const A & a, const A & b) {return a.getA()<b.getA();}}; inserted at Place 2 replacing line marked 3 with set<A, R>s(t, t+10); replacing line marked 4 with multiset<A,R> s1(s.begin().s.end()); replacing line marked 5 with multiset<A,R>::iterator i=s1 .begin();
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