Problem 2. Fractal Tree (5 points) A tree fractal is usually the first fractal to be learned. It is generated by recursively dividing a stem into two branches right and left and recursively drawing them. Complete the function draw_tree( t, branch, angle, n ) shown below, where t is a turtle object, branch is the length of a branch, angle is an angle between the branch and the stem, n is a level of recursion. Please make sure that your function works with the provided code. Please name your file tree_fractal.py