Refer to the exhibit.
After this new OSPF design with per-packet load balancing was implemented, Host A reported that large file downloads from Server A became slow and sometimes failed. The operations team discovered that packets are arriving out of order on R1. Which cost-conscious redesign action will fix the issue?
A. Upgrade all links to 10 Gbps.
B. Add an IP SLA probe on R1 and R4.
C. Adjust the OSPF auto-cost reference bandwidth on R4.
D. Adjust the OSPF auto-cost reference bandwidth on all routers.