For the trajectory 7 (t) = find the le of the trajectory on the interval 0s ts In2. O A. 2COS2 O B. 215 OC. 3 OD . 2 13 d ) Find an equation of the plane passing through the points P (5,3,1) , Q (1,3, -5), R(-1,3,1) . O A. 2 (x- 5) +3(y-3) +4(z-1) =0 O B. 3 (x - 5) +5(y-3) +4(z-1) =0 O c. y = 3 OD. Z = 1