Which switch interface error indicates the 10/100/1000 IEEE Gigabit interface operating mode mismatch?

You are now in a LAN troubleshoot, and you suspect that the error was due to operating mode mismatch.

Which switch interface error indicates the 10/100/1000 IEEE Gigabit interface operating mode mismatch? (Multiple choice)
A . Alignment Error
B . FCS Error
C . Multiple Collisions
D . Ultra-small Frame
E . Excessive Conflict
F . Lag Conflict

Answer: ABDEF