Which of the following is a system management tool? an event viewer a firewall antivirus software a spam filter

The answer is antivirus software

Antivirus software is a system management tool.

Explanation:

Antivirus software refers to software used for the purpose of detecting, preventing and removing software viruses and other malware from the computer. Antivirus software is important for computer users because a computer without it will be at the risk of viruses after connecting to the internet.  Antivirus software searches for threats and monitors the behavior of all programs. It blocks malware as quickly as possible.

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.