In the network shown in the figure, adjacent routers use directly connected interfaces to establish EBGP neighbor relationships. The Router ID of each device is 10.0.XX, and the AS number is 6500x…

In the network shown in the figure, adjacent routers use directly connected interfaces to establish EBGP neighbor relationships. The Router ID of each device is 10.0.XX, and the AS number is 6500x, where X is the router number. R1 and R4 both have static routes to 192.168.1.0/24, which are introduced into BGP through import. By default, among the routes received by R6 regarding 192.168.1.0/24, which of the following has the longest AS_path?