Which three statements about VXLANs are true? (Choose three.)

A.
It requires that IP protocol 8472 be opened to allow traffic through a firewall.

B.
Layer 2 frames are encapsulated in IP, using a VXLAN ID to identify the source VM.

C.
A VXLAN gateway maps VXLAN IDs to VLAN IDs.

D.
IGMP join messages are sent by new VMs to determine the VXLAN multicast IP.

E.
A VXLAN ID is a 32-bit value.