Which of the following steps must an amateur operator take to ensure compliance with RF safety regulations?

The FCC requires amateur radio operators to take responsibility for the RF energy their stations produce. To ensure compliance with safety regulations, you must perform a routine RF exposure evaluation if your transmitter power exceeds certain thresholds. If your evaluation reveals that certain areas exceed the Maximum Permissible Exposure (MPE) limits for either controlled (your property) or uncontrolled (public or neighbor) environments, you are required to take action. The most direct and necessary step is to prevent human access to those high-exposure areas during transmission. Other options, such as posting a copy of the FCC rules or notifying neighbors within a 100-foot radius, are completely fabricated distractors and are not required by FCC rules. Safety compliance is strictly about evaluating the field strength and mitigating actual human exposure.