For a ground-to-ground projectile with zero air resistance, choose the correct statement(s).

(a) A projectile is freely falling body, since the only force acting on the body is due to gravity.(b) Acceleration at every point on the trajectory is g.(c) Time of flight will be maximum when θ = 90° and Range is maximum when θ = 45° for a given speed of projection.(d) Acceleration is perpendicular to the velocity at the highest position of its trajectory and at this position acceleration is maximum and equal to g.