Which of the following statements are correct regarding how OSPF detects old and duplicate LSAs? (Choose three.)

Which of the following statements are correct regarding how OSPF detects old and duplicate LSAs? (Choose three.)

A. The smaller the sequence number, the more recent the LSA. B. The smaller the LS age, the more recent the LSA. C. When router generates a new LSA at the first time, it will use 0x80000001 as the sequence number. D. An LSA can be flushed from routing domain by setting its LSA age to Maxage.