Which pieces of code inserted independently into places marked 1 and 2 will cause the program to compile and display: 0 1 2 3 4 5 6 7 8 9? Choose all that apply.
A. place 1: operator int() {return a;}
B. place 1: operator int() {return a;} bool operator < (const A & b) {return this?>a< b.a;}
C. place 1: bool operator < (const A & b) {return this?>a< b.a;}
D. place 1: bool operator < (const A & b) {return this?>a< b.a;} friend ostream & operator <<(ostream & c, const A & a); place 2: ostream & operator <<(ostream & c, const A & a) {c<<a.a; return c;}
E. place 1: bool operator < (const A & b) {return this?>a< b.a;} place 2: ostream & operator <<(ostream & c, const A & a) {c<<a.a; return c;}
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