ATC clears Fastair 345 to descend from FL 100 to FL 80. What is the correct read back by the pilot:

Question

ATPL - Airline Transport Pilot license - IFR Communications - ATC clears Fastair 345 to descend from FL 100 to FL 80. What is the correct read back by the pilot:

QuizVDS · Accepted Answer

Leaving flight level 100 descending to flight level 80, Fastair 345

QuizVDS · Answer

Leaving 100 to 80, Fastair 345

QuizVDS · Answer

Down to flight level 80, Fastair 345

QuizVDS · Answer

Descending to 80, Fastair 345

ATPL: ATC clears Fastair 345 to descend from FL 100 to FL 80. What is the correct read back by the pilot:

Domanda 67, IFR Communications - ATPL - Airline Transport Pilot license