After a network element has enabled the intelligent feature, it cannot join the intelligent domain. What are the possible reasons? (Multiple choice)
A . Network element data is not uploaded;
B . Smart domain is not refreshed;
C . Electrical layer DCC is not smooth;
D . ODU1_PM_AIS exists on the N board;
E . N board DCC management RES_ODU channel status is not enabled;
Answer: ABCE