EIGRP is being used as the routing protocol on the PassGuide network. Whiletroubleshooting some network connectivity issues，you notice a large number of EIGRP SIA（StuckinActive）messages. What causes these SIA routes（）

• A、The neighboring router stops receiving ACK packets from this router.
• B、The neighboring router starts receiving route updates from this router.
• C、The neighboring router is too busy to answer the query(generally caused by high CPU utilization).
• D、The neighboring router is having memory problems and cannot allocate the memory to process the query or build the reply packet.