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

A、Some quer y 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、Th e neighboring router stops receiving ACK packets from this router.