Which two statements are true about 802.1s？（）

• A、802.1s supports a reduced number of spanning-tree instances.
• B、802.1s has better convergence times than 802.1w.
• C、802.1s does not support load balancing over the same physical topology.
• D、The CPU utilization for 802.1s is lower than the CPU utilization for 802.1w.