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Etant donné que la classe A étend la classe B , trouvez une ligne correcte pa...

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Etant donné que la classe A étend la classe B, trouvez une ligne correcte parmi les suivantes:

A x= new A(); B y = x; A z=y;

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B y =new B(); A x= (A)y; B z=x;

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A x= new A(); B y = x; A z=(A)y;

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B y =new B(); A x= (A)y; B z=(B)x;

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