What kind of techniques can detectives use for surveillance?

The correct choice highlights a range of techniques that are effective for surveillance in detective work. Video monitoring allows for the observation of subjects from a distance and can capture evidence without the subject being aware they are being watched. This method can provide crucial visual evidence in cases where direct interaction is not feasible or safe.

Undercover operations involve detectives embedding themselves within groups or environments related to the investigation. This approach can yield invaluable insights and information that would be difficult to obtain through other means, as it allows for firsthand observation of activities, interactions, and behaviors.

Electronic tracking involves the use of technology to monitor an individual's movements or communications. This could include GPS tracking of vehicles or monitoring online activities, which can help law enforcement gather information on suspects without direct engagement.

The other choices do not accurately represent the breadth of surveillance techniques available. For example, focusing solely on undercover work and informants ignores the technological advancements that enhance modern investigative methods. Similarly, relying only on written reports and verbal statements lacks the direct observational capabilities that video monitoring and other methods provide. Lastly, direct confrontation with suspects is typically reserved for specific situations and is not a general surveillance technique, as it risks alerting the suspect and disrupting ongoing investigations.