Regarding the description of Private VLAN technology and Super VLAN technology, which of the following is correct?

Regarding the description of Private VLAN technology and Super VLAN technology, which of the following is correct?
A . Super VLAN technology is also called VLAN aggregation. Its main purpose is to solve the problem of IP address waste or insufficient VLAN interface quantity.
B . Private VLAN is a Layer 2 VLAN technology, so switches that support Private VLAN technology are all Layer 2 switches.
C . Super VLAN is a three-layer VLAN technology, so the switches that support Super VLAN technology are all three-layer switches.

Answer: C