Which feature is not supported by the vSphere 5.5 Distributed Switch?

Which feature is not supported by the vSphere 5.5 Distributed Switch?

A.
Multiple link aggregation groups

B.
Differentiated Service Code Point (DSCP) QOS at layer3

C.
Packet captures at the uplink, virtual switch port, or vNIC

D.
IGMP snooping at layer 2