Routers R1 and R2 are OSPF neighbors using their Fa0/0 interfaces, respectively, using default settings for all timers. An engineer ad ds the ip ospf hello - interval 6 command to R1's Fa0/0 configuration. Which of the following is true regarding the results from this change?（）

• A、The show ip ospf neighbor command on R1 lists the revised Hello timer
• B、The show ip ospf interfac e brief command on R1 lists the revised Hello timer
• C、The R1 - R2 neighborship fails due to Hello timer mismatcH
• D、The show ip ospf interface command on R1 lists the revised Hello timer