Which two steps ensure that traffic to the provider flows through R2 while the network is working properly?

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In the exhibit, R1 and R2 have a static default route configured that points toward the provider. Both routers redistribute the default route into OSPF.R2 is the preferred gateway to reach the provider.R1 is the backup gateway. All link metrics are equal.

Which two steps ensure that traffic to the provider flows through R2 while the network is working properly? (Choose two.)
A . Redistribute the default route as a Type 1 external route on router R1 and a Type 2 external route on router R2.
B . Redistribute the default route as a Type 2 external route on router R1 and a Type 1 external route on router R2.
C . Modify the preference value of the default route on router R1 so that it is less preferred than OSPF external routes.
D . Modify the preference value of the default route on router R2 so that it is more preferred than OSPF external routes.

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Answer: B,C