Question ATPL - Airline Transport Pilot license - Air Law

ATPL - Alert phase is defined as follows:

A situation related to an aircraft which reports that the fuel on board is exhausted.

A situation where an apprehension exists as to the safety of an aircraft and its occupants.

A situation related to an aircraft and its occupants are considered to be in a state of emergency.

An emergency event in which an aircraft and its occupants are considered to be threatened by a danger.