Question id 27 - Air Law - Quiz SPL - Sailplane Pilot License

Height of the base of the highest layer of clouds covering more than half of the sky below 20000 ft.
Height of the base of the lowest layer of clouds covering more than half of the sky below 10000 ft.
Height of the base of the lowest layer of clouds covering more than half of the sky below 20000 ft.
Altitude of the base of the lowest layer of clouds covering more than half of the sky below 20000 ft.