Equation of the line passing through centre and bisecting the chord \( 7 x+y=20 \) of the ellips...

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Equation of the line passing through centre and bisecting the chord \( 7 x+y=20 \) of the ellipse \( x^{2}+\frac{y^{2}}{7}=1 \), is:
(a) \( x+y=5 \)
(b) \( x+y=0 \)
\( -(c) x-y=0 \)
(d) \( x-y=5 \)
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