What altimeter setting must the Tower controller transmit to an arriving aircraft prior to landing, and what unit of measurement is standard in Bolivia?

1. The current QNH (aerodrome pressure reduced to mean sea level), expressed in hectopascals (hPa).
2. The QFE only, expressed in pounds per square inch.
3. The outside air temperature in Fahrenheit.
4. A runway-condition percentage in place of a pressure setting.