Consider the vector eld F(x,y) = y i + xj and the line integral IF . dr once in the counterclockwise direction around the curve C given by x2 + 5:2 = 1. Select the best description of C that line integral' 0 A. negative 0 B. zero, because it is conservative O 0. positive 0 D. none of the above mMG Consider the line integral IFdr once counterclockwise around the closed loop C given by C (X-5)2 + (v: 5)2 = 22. Select the best description of that line integral: 0 A. zero A gravitational vector eld is given by F = grad\") where f(x,v,z) = for positive constants m, M and G. O B. negative 0 C. positive 0 D. none of the above