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若圆C:x2+y2-ax+2y+1=0和圆x2+y2=1关于直线y=x-1对称,...
若圆C:x2+y2-ax+2y+1=0和圆x2+y2=1关于直线y=x-1对称,动圆P与圆C相外切且直线x=-1相切,则动圆圆心P的轨迹方程是( )
A.y2+6x-2y+2=0
B.y2-2x+2y=0
C.y2-6x+2y-2=0
D.y2-2x+2y-2=0
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