Sunrise Consultancy is a medium-sized consulting firm that operates 17 offices around the world (Dallas, Chicago, New York, Atlanta, Miami, Seattle, Los Angeles, San Jose, Toronto, Montreal, London, Paris, Sao Paulo, Singapore, Hong Kong, Sydney, and Bombay). They have been using Internet connections to exchange e-mail and files, but the volume of traffic has increased to the point that they now want to connect the offices via WAN. Volume is low but expected to grow quickly once they implement a new knowledge management system. What type of WAN topology and WAN service would you recommend? Why?