Violet has been hired to evaluate the security of Blazersfire's company network. The company's security policy restricts employees from using the internet messenger programs to make outbound connections. Violet reviews the logs for the company's firewall and verifies that traffic is denied on the correct ports and that the firewall is operating expectedly. however, violet is still getting reports of IRC usage by some employees. Which reason best describes how some employees are still able to use IRC through the company's firewall?

-The employees are spooding their IP addresses

-The employees are managing to shut down the company's firewall before making outbound connections

-The employees are using HTTP tunneling to pass traffic through the router

-The employees are using the firewalk tool to bypass the company's firewall