A nurse plans to measure a client's temperature orally. Which action should the nurse take first to ensure an accurate measurement?

Ask the client to breathe through their mouth during the temperature measurement.

Place the thermometer directly under the client's tongue immediately after removing it from the probe cover.

Ask the client if they have consumed hot or cold food, beverages, or smoked within the last 15 minutes.

Instruct the client to keep their mouth slightly open during the measurement.