Suppose that you are going to program a computer to carry out an iterative calculation of motion involving nonconstant forces. Which of the following calculations should be done before starting the repetitive "loop" calculations?(A) Define constants such as 14πε0. (B) Update the (vector) position of each object.(C) Calculate the (vector) forces acting on the objects. (D) Specify the initial (vector) momentum of each object.(E) Specify an appropriate value for the time step.(F) Specify the mass of each object.(G) Update the (vector) momentum of each object.