What is an advantage of packet-switched technology over circuit-switched technology

Packet-switched networks are less susceptible to jitter than circuit-switched networks are
Packet-switched networks can efficiently use multiple routes inside a service provider network
Packet-switched networks do not require an expensive permanent connection to each endpoint
Packet-switched networks usually experience lower latency than circuit-switched networks experience

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What type of connectivity is established when VPNs are used from the remote site to the private network
PVCs
DLCIs
tunnels
virtual circuits
dedicated Layer 2 links