Find an arc length parametrization of ( r(t) = ⟨ 2t², 4t² ⟩ ). (Use symbolic notation and tions where needed.)

a) ( x(t) = 2t², ) ( y(t) = 4t² )
b) ( x(t) = t², ) ( y(t) = 2t² )
c) ( x(t) = {1/{2t², ) ( y(t) = t² )
d) ( x(t) = {1/{4t², ) ( y(t) = {1/{2t² )