Solve the differential equation du/dt= 1 + 2v + t + tv
A) u(t) = 1/2t² + t + C
B) u(t) = 1/2t² + C
C) u(t) = 1/2t² + tv + C
D) u(t) = 1/2t² + t² v + C
E) u(t) = 1/2t² + t²+ C