What is the purpose of the switched virtual interface on a multilayer switch?

What is the purpose of the switched virtual interface on a multilayer switch?
A . enables the switch to perform QoS functions such as CBWFQ, LLQ, and traffic shaping
B . allows the multiprotocol switch to load balance traffic across trunk ports
C . provides basic Layer 3 functions for the Layer 2 switch ports assigned to a VLAN
D . prevents routing and bridge loops by creating broadcast and collision domains

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Answer: C