问题：

[多选] Which two statements are true about MLP interleaving？ （）

A .  It fragments and encapsulates all packets in a fragmentation header.
B .  Packets smaller than the fragmentation size are interleaved between the fragments of thelarger packets.
C .  Packets larger than the fragmentation size are always fragmented， and cannot be interleaved，even if the traffic is voice traffic.
D .  It fragments and encapsulates packets that are longer than a configured size， but does not encapsulate smaller packets inside a fragmentation header.