Find the unit tangent vector T and the curvature k for the following parameterized curve. r(t) = (7 cos t,7 sin t,7t) Choose the correct answer for the unit tangent vector of r(t). V14 O A. T(t) = V14 sin t, 4 V2 4 cos t, 4 V14 V14 sin t, 4 12 ccos t, 4 B. T(t) = 4 14 14 O C. T(t) = sint, cos t, 4 4 4 V14 sin t, 4 V14 O D. T(t) = cos t, 4 4