One method of heuristic analysis allows the suspicious file to run in a guarded environment called a

It is called a sandbox, the one method of heuristic analysis allows the suspicious file to run in a guarded environment. If the file exhibits malicious behavior, it is treated like a virus and quarantined and deleted.
The heuristic analysis is called the antivirus software that can use techniques. 

Field experiment direct observation method

Explanation:

This is the method in which the researcher observes and manipulates the one and more independent variables. It occurs in natural settings to observe the effect of behavior.

This is the extreme form of intervention observation in the method. When field experiments conducted it makes casual inferences from the observation.

Confounding in the experiments may decrease the validity of the research method. Due to con-foundation, ethical issues occur related to a high risk of low internal validity.