Select all of the following pairs of parametric equations that represent circles. x(t) = 1+cos(t), y(t) = 1-sin(t) x(t) = 1+cos(t), y = 2+cos(t) x(t) = 1-sin(t), y(t) = 1-cos(t) x(t) = 2cos(t), y(t) = 3sin(t)+4 x(t) - 9+t, v(t) - 8+5t