Which of the following applies to the case of packet switching?

It is a WAN connection method that creates a dedicated point$-$to$-$point connection from the customer$$s LAN through the provider$$s network and to the destination network.

X$\mathrm{.}25$ and frame relay are among the most common methods in packet$-$switched networks.

Packet$-$switched WANs use virtual circuits to ensure that packets are delivered reliably and at the agreed$-$on bandwidth level.

All of the above