qual das equacoes abaixo representa a circunferencia de centro (2,-1) e é tangente a reta de equacao y= -x+4 --> 1x+1y-4=0?

a) 9.(x-2)²+9(y+1)²=2

b) 2.(x+2)²+2(y-1)²=9

c) 2.(x-2)²+2(y+1)²=9

d) 4.(x-2)²+4(y+1)²=9

e) 4.(x-2)²+4(y-1)²=9

me ajudem por favorrrr, é pra hoje bjss ... darei pontos

Update:

justifiquem a resposta bjo

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