Which technology should a network designer combine with VSS to ensure a loop free topology with optimal convergence time?

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Which technology should a network designer combine with VSS to ensure a loop free topology with optimal convergence time?
A . PortFast
B . UplinkFast
C . RPVST+
D . Multichassis EtherChannel

Answer: D

Explanation:

"C" definitely not as STP is disabled when VSS is configured at the distribution layer.

MEC comes with Cisco Catalyst (VSS) like vPC comes with Cisco NX-OS.