Lin is designing a virtual private network $($VPN$)$ implementation as a class project. The assignment includes a budget she has to follow. To save money, she decided to use a VPN without a firewall. What is the problem with her decision?

Group of answer choices

This approach will work only if the VPN appliance is the primary device facing the Internet at the front of the network's demilitarized zone $($DMZ$).$

This approach will work only with VPN hardware devices.

This approach will work only with a software VPN$.$

This approach will not work because VPNs cannot take the place of firewalls.