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？（）
- ASome query or reply packets are lost between the routers
- BThe neighboring router starts receiving route updates from this router
- CA failure causes traffic on a link between two neighboring routers to flow in only one direction（unidirectional link）
- DThe neighboring router stops receiving ACK packets from this router