4. For the parts below, let C be the straight line segment from (I), D) to (3, 4). (a) (1 Point) Give a vector parametrization for C, remembering (as always) to give the domain of your parametriza- tion. r(t) = (b) (1 Point) Compute F = Vf - the vector eld that is equal to the gradient of f(z,y) = 1.1:.(1 + $2 + ya). F1359) = (c) (1 Point) Use parts (a) and (b) to calculate the vector line integral f F - dr. C