In windows firewall allowed apps which of the choices is not possible?

Answer: Allow Port

Explanation: 

Windows firewall allows you to allow or block specific applications from opening ports on your computer. However, this feature is not always available, and can be somewhat confusing. In order to allow an application access to a port, you must first open the Windows firewall settings. Then, click on the "Allow Port" button in the "Firewall" section. You will then be presented with a list of all the ports that the application can access. To allow access to a specific port, simply select it from the list and click on the "Allow" button. If you want to block an application from accessing a port, you must first open the Windows firewall settings. Then, click on the "Block Port" button in the "Firewall" section. You will then be presented with a list of all the ports that the application can access. To block an application from accessing a specific port, simply select it from the list and click on the "Block" button.