Refer to the exhibit.

What is the simplest way to configure routing between the regional office network
10.89.0.0/20 and the corporate network?

A.
router1(config)#ip route 10.89.0.0 255.255.240.0 10.89.16.2

B.
router2(config)#ip route 10.89.3.0 255.255.0.0 10.89.16.2

C.
router1(config)#ip route 10.89.0.0 255.255.240.0 10.89.16.1

D.
router2(config)#ip route 0.0.0.0 0.0.0.0 10.89.16.1

Explanation:
The fourth command makes it possible for all hosts beyond R2 and all hosts beyond R1 to
interact with each other, hence it is the most simplest technique.