It's a malware, and it basically let's the person/hacker/culprit get information off your computer without the owner of the computer knowing that the person is doing it. It's often used to find keystrokes, passwords, online interaction, and other personal data.
The question is vague, but answer B is absolutely incorrect so by default choice A is correct ... "good" is hard to define and your vision can be corrected by glasses allowing you to drive, etc.
D. Indie developer. Independent video game development, or indie game development, is the video game development process of creating indie games; these are video games, commonly created by individual or small teams of video game developers and usually without significant financial support of a video game publisher or other outside source.
The program Nslookup, is available on all operating systems and provides all types of information from a DNS server and allows you to query all types of information from a DNS server and change how your system uses DNS.
The network administration command-line tool nslookup can be used to verify that your DNS servers can resolve external domain names.
