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The equation of the parabola whose vertex is \( (a, 0) \) and the directrix has the equation \( x+y=3 a \), is
(A) \( x^{2}+y^{2}+2 x y+6 a x+10 a y+7 a^{2}=0 \)
(B) \( x^{2}-2 x y+y^{2}+6 a x+10 a y-7 a^{2}=0 \)
(C) \( x^{2}-2 x y+y^{2}-6 a x+10 a y-7 a^{2}=0 \)
(D) none of these
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