If 200 counts per minute above the instrument background is indicated during a survey with a handheld frisker, you should:

The correct answer underscores the importance of verifying the initial readings obtained from a handheld frisker before taking further action. When a count per minute reading shows a significant increase above the background level, it's essential to resurvey the area. This step ensures that the reading is accurate and not a result of temporary fluctuations or instrument errors.

By confirming the counts with a second survey, the individual gains a clearer understanding of the radiation levels. If the higher counts are verified through a consistent repeat measurement, it signals that further action is warranted, which includes notifying Radiation Control (Rad Con) for potential follow-up and response.

Remaining in the area, assuming the counts are consistently elevated, is acceptable only if there is no imminent danger and you're in a position to do so safely. This approach allows for timely reporting and appropriate responses to any potential radiological hazards, enhancing safety protocols in the work environment.

In contrast, the other options tend to involve either premature evacuations or unnecessary changes to settings without confirming the reliability of the initial data, which can lead to confusion and inappropriate responses to radiation levels.