In 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？（）
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.
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