Question id 575 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Will Only Form At Oat's Below +10°c.
Will only form at outside air temperatures (OAT's) below the freezing point of water.
Will only form at outside air temperatures (OAT's) below the freezing point of water.may form at OAT's higher than +10°
Will Only Form At Oat's Below The Freezing Point Of Fuel.