【单选题】
A [R 2] ospf 1[R 2-0spf-1] ara 0[R 2-ospf-1-area-0.0.0.0] time rhel1o 10
B [R 2] interface GigabitEthernet 0/0/0[R 2-GigabitEthernet o/0/0] undo ospf timer hel1o
C [Rel inter tace GigabitEthernet 0/0/0[R 2-6igabitErhernet 0/0/0] ospftimerhel1o 20
D [R 2] ospf 1[R 2-ospf-1] area O[R 2-ospf=l-area 0.0.0.0lundotimerhel1o
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