From the following statements, select all that are correct about Virtual Private Networks $($VPNs$).$

$$ VPN links are meant to be established over the public Internet rather within an organization's network.

$$ In order to provide better security, a VPN link should normally communicate through a WAN circuit that is created between two distributed campuses of an organization.

$$ The VPN traffic is transparent to the public Internet in that it can be regarded just as a stream of IP packets.

$$ A VPN tunnel guarantees quality of service $($QoS$)$ criteria such as dedicated bandwidth and low delay requirements between the sender and receiver.

$$ AVPN tunnel is formed by first encrypting each application layer message and then encapsulating it into a TCP segment with a dedicated source port number.