What are the two reasons for the appearance of 0.0.0.0 as the next hop for a network when using the "show ip bgp" c ommand?（）

• A、The network was originated via redistribution of an interior gateway protocol into BGP.
• B、The network was defined by a static route.
• C、The network was learned via IBGP.
• D、The network was learned via EBGP.
• E、The network was  originated via a network or aggregate command.