Card 7 / 15: Considering the following definitions, which of the provided statements (if any) are invalid? double x= 0.5, y=4.9; double *px, *py, &rx=x;
A) px =&x; double &rx = *px ;
B) px = py;
C) double &ry = rx;
D) px = px = rx;
E) px = py = *x;

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