A(n) is a combination of hardware and software that filters or prevents specific information from moving between the outside world and the inside world. A(n) is a combination of hardware and software that filters or prevents specific information from moving between the outside world and the inside world.

A firewall

Explanation:

A firewall is either hardware or software that acts as a defense system for your computers against external attacks that come in form of worms, malware, or malicious actors. It does this by filtering the information that comes in from the internet. It blocks malicious and unwarranted traffic and permits wanted traffic. It acts a barrier between users in a private network and the public internet.

b and c ( ip address and port number)