On the OSPF network shown in the figure, the cost values of links are marked, and OSPF IP FRR is enabled on R1. Which of the following statements are true?
A.
No backup path can be established between R1 and 10.0.3.3/32.
B.
If SI is powered off, R1 directly uses the backup path to forward packets to R3.
C.
If BFD (with default detection parameters) is enabled on the entire network and the link between R2 and SI is disconnected, R1 can quickly detect the OSPF adjacency fault.
D.
If the link between R1 and SI is disconnected, R1 directly uses the backup path to forward packets to R3.
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