Which three statements about OSPF partial SPF are true？（）

• A、If it is triggered by Type 4， all Type 4 LSAs that announce a certain ASBR and all Type 5 and 7 LSAs are processed
• B、If it is triggered by Types 5 and 7， all Type 5 and 7 LSAs that contribute to a certain destination are processed.
• C、If it is triggered by Type 2， all Type 2 LSAs that contribute to a certain destination are processed.
• D、If it is triggered by the change of Type 3， 4， 5， and 7 LSAs.
• E、If it is triggered by the change of Type 2， 3， 5， and 7 LSAs