Suppose that Sharifa is going to visit branch offices of her medical supply company based in City A with branch offices in various cities. How many different ways can she begin in City A, visit all branches, and return home? The diagram at the right shows the possible routes for visiting (a) 1 city, (b) 2 cities, and (c) 3 cities. If the number of routes for five cities is 120, find the total number of routes for six cities, then find the total number of routes for seven cities. How many ways can Sharifa visit six cities? OA. 600 OB. 720 OC. 20 OD. 126 (a) (c) B (b) B N N- C B B N B B