In the diagram, the customer is using static routing to connect to the ISP. Which configuration on the ISP edge routers will enable load balancing and backup of the traffic to the customer?
Exhibit:
A.
! R1
ip route 10.1.1.0 255.255.255.128 serial 0
! R2
ip route 10.1.1.128 255.255.255.128 serial 0
B.
! R1
ip route 10.1.1.0 255.255.255.0 serial 0
! R2
ip route 10.1.1.128 255.255.255.0 serial 0
C.
!R1
ip route 10.1.1.0 255.255.255.128 serial 0
ip route 10.1.1.128 255.255.255.128 serial 0
!R2
ip route 10.1.1.128 255.255.255.128
serial 0 ip route 10.1.1.0 255.255.255.128 serial 0
D.
! R1
ip route 10.1.1.0 255.255.255.128 serial 0
ip route 10.1.1.0 255.255.255.0 serial 0
! R2
ip route 10.1.1.128 255.255.255.128 serial 0
ip route 10.1.1.0 255.255.255.0 serial 0