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.