Refer to the exhibit.

All switch interfaces shown in the exhibit have these characteristics:
Are configured in routed-mode
Have IP addresses
Run Open Shortest Path First (OSPF)
Network architect wants to ensure that routing switch 1 uses the faster link in preference to the
slower link, which should be used in failover situations. Which step should be architect perform to
meet this requirement?

A.
Disable ECMP on Routing switch 1 and on other routing switches for consistency.

B.
Set the designated router preference on Routing switch 2 interface Forty1/0/48 to a lower level
than on Routing switch 3 interface Ten1/0/1:1.

C.
Set the OSPR reference bandwidth on the routing switches to an appropriate level, such as
100000 Mbps.

D.
Configure Routing switch 1 interface Ten1/0/1:1 as a silent, or a passive, OSPF interface.

Explanation: