n your Cisco EIGRP network， you notice that the neighbor relationship between two of your routers was recently restarted. Which two of these choices could have made this occur？（）

• A、An update packet with init flag set from a known， already established neighbor relationship was received by one of the routers.
• B、The ARP cache was cleared.
• C、The counters were cleared.
• D、The IP EIGRP neighbor relationship was cleared manually.