Question ATPL - Airline Transport Pilot license - Meteorology

ATPL - Which of the following are favourable conditions for the formation of freezing rain?

Cold air aloft from which hail is falling into air that is warm.

Water droplets falling from cold air aloft with a temperature below 0°C into air with a temperature above 0�

An isothermal layer aloft with a temperature just above 0°C through which rain is falling.

Warm air aloft from which rain is falling into air with a temperature below 0°