For very low-speed links (those with a link speed of less than 768 K), it is necessary to use techniques that provide link fragmentation and interleaving of packets. This prevents voice traffic from being delayed behind large data frames and hence bounds jitter.
What are two techniques that exist for this?

A.
Ipngfor DSL links

B.
LECS for ATM links

C.
Multilink PPP (MLP) for serial links

D.
FRF.12 for Frame Relay