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.