If \( x^{2}+4 y^{2}-4=0 \) and minimum and maximum values of \( x^{2} \) \( +y^{2}-x y \) are \(...

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If \( x^{2}+4 y^{2}-4=0 \) and minimum and maximum values of \( x^{2} \) \( +y^{2}-x y \) are \( \mathrm{a} \) and \( \mathrm{b} \) respectively then
(a) \( a=\frac{5-\sqrt{13}}{2} \)
(b) \( b=\frac{5+\sqrt{13}}{2} \)
(c) \( a=\frac{-5-\sqrt{13}}{2} \)
(d) \( b=\frac{5 \sqrt{13}}{2} \)
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