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?

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