【单选题】
A [R2] ospf 1
[R2-ospf-1] area 0
[R2-ospf-1-area-0.0.0.0] timer hello 10
B [R2] interface GigabitEthernet 0/0/0
[R2-GigabitEthernet0/0/0] undo ospf timer hello
C [R2] interface GigabitEthernet 0/0/0
[R2-GigabitEthernet0/0/0] ospf timer hello 20
D [R2] ospf 1
[R2-ospf-1] area 0
[R2-ospf-1-area-0.0.0.0] undo timer hello
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