VTP is configured on switch R1. Which of the following features were added in VTP version 2 that  were not previously supported in VTP version 1？（）

• A、Supports Token Ring VLANs.
• B、Allows VLAN consistency checks.
• C、Saves VLAN configuration memory.
• D、Reduces the amount of configuration necessary.
• E、Allows active redundant links when used with spanning tree.