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(1 point) Let C be a counter-clockwise planar circle with center at the origin and positive radius. Without computing them, determine for the following vector fields F whether the line integrals , F . dr are positive, negative, or zero and type P, N, or Z as appropriate. A. the radial vector field = F(x, y) = xi + yj B. the circulating vector field = F(x, y) = -yi + xj: C. the circulating vector field = F(x, y) = yi - xj: D. the constant vector field = F(x, y) = i+j