Which of the following specifications is a companion to the IEEE 802.1w Rapid Spanning Tree Protocol （RSTP） algorithm， and warrants the use multiple spanning-trees？ （）A、 IEEE 802.1s （MST）B、 IEEE 802.1Q （CST）C、 Cisco PVST+D、 IEEE 802.1d （STP）E、 None of the other alternatives apply
Which of the following specifications is a companion to the IEEE 802.1w Rapid Spanning Tree Protocol （RSTP） algorithm， and warrants the use multiple spanning-trees？ （）
- A、 IEEE 802.1s （MST）
- B、 IEEE 802.1Q （CST）
- C、 Cisco PVST+
- D、 IEEE 802.1d （STP）
- E、 None of the other alternatives apply
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