If $\alpha$ and $\beta$ are the roots of the equation $ax^2+bx+c=0$ and , if $px^2+qx+r=0$ has roots $\large\frac{1- \alpha}{\alpha}$ and $\large\frac{1-\beta}{\beta}$, then r is equal to

Question

$$\begin {array} {1 1} (a)\;a+2b & \quad (b)\;a+b+c \\ (c)\;ab+bc+ca & \quad (d)\;abc \end {array}$$