Which of these statements is true about a VSS?

You are about to migrate a customer network to use a VSS. Which of these statements is true about a VSS?

A.
The VSS switch must be the root bridge for all VLANs and is automatically designated.

B.
The VSS switch is defined in RFC 4318 as a managed object.

C.
The PAgP+ or LACP protocols are used to maintain the operational state of the VSS devices. D. A VSS interoperates with a virtual port channel.

D.
The 802.1Q or ISL protocols are used to maintain the operational state of the VSS devices.

E.
A VSS increases the size of the spanning-tree domain.