Routers R1 and R2 are EIGRP neighbors using their Fa0/0 interfaces, respectively. An engineer adds the ip hello - interval eigrp 9 6 command to R1's Fa0/0 configuration. Which of the following is true regarding the results from this c hange？（）

• A、The show ip eigrp neighbors command on R1 lists the revised Hello timer
• B、The show ip eigrp interfaces command on R1 lists the revised Hello timer
• C、The R1 - R2 neighborship fails due to Hello timer mismatcH
• D、The show ip eigrp interfaces detail command on R1 lists the revised Hello timer