Which of the following statements regarding Selective Packet Discard(SPD) is correct?

A.
Selective Packet Discard(SPD) is a mechanism to drop non-routing packets instead of routing packets when the process level queue is congested.

B.
Selective Packet Discard(SPD) is a mechanism to drop packets with low IP precedence instead of packets with high IP precedence when the link is overloaded

C.
Selective Packet Discard(SPD) is a mechanism to drop Frame Relay frames with the DE bit set instead of Frame Relay frames DE bits without being set when the link is overloaded

D.
Selective Packet Discard(SPD) is a mechanism to drop normal IP packets instead of VOIP packets when the link is overloaded

E.
None of above.