Experiments. ...
Surveys. ...
Questionnaires. ...
Interviews. ...
Case studies. ...
Participant and non-participant observation. ...
Observational trials. ...
Studies using the Delphi method.
Answer:
Assuming this can only have one answer, i believe adware is very far from the type of malware that did infect the system, Spyware.
Explanation:
User interface is the answer
A correlation is a consistent relationship between two or more variables. It relates to our tendency to draw causation from mere correlation.
The answer B. a switchboard
