Refer to the exhibit.
Router R1 Fa0/0 cannot ping router R3 Fa0/1.
Which action must be taken in router R1 to help resolve the configuration issue?
A.set the default network as 20.20.20.0/24 B.set the default gateway as 20.20.20.2 C.configure a static route with Fa0/1 as the egress interface to reach the 20.20.20.0/24 network D.configure a static route with 10.10.10.2 as the next hop to reach the 20.20.20.0/24 network正确答案D
