Explain what it means for a curve to be parameterized by its arc length. Choose the correct answer below. O A. An increment of the At in the parameter corresponds to an increment of exactly At in the arc length. O B. If the parameter t is used to describe a point on a curve because it represents time at a given unit. O C. If the parameter t used to describe trajectory also measures the arc length s of the curve that is generated, the curve has been parameterized by its arc lengthConsider the following position function. a. Find the velocity and speed of the object. b. Find the acceleration of the object. r(t)= 5ez +9,5 2 2t 21 + 1, fort= 0 a. What is the velocity of the object? v(t) = for t 2 0 The speed of the object is for t = 0. (Type an exact answer in terms of e.) b. What is the acceleration of the object? a(t) = for t= 0