While troubleshooting an EIGRP routing problem you notice that one of the company routers havegenerated a large number of SIA messages. What are two possible causes for EIGRP Stuck-In-Active routes？（）

• A、Some query or reply packets are lost between the routers
• B、The neighboring router starts receiving route updates from this router
• C、A failure causes traffic on a link between two neighboring routers to flow in only one direction（unidirectional link）
• D、The neighboring router stops receiving ACK packets from this router