The essential components of a flight director are :
1- a computer
2- an automatic pilot
3- an autothrottle
4- command bars
I think I see why you’re asking this question as it was showing the correct answer as 1 and 2 which cannot be true. I have corrected the error in the database.
An autopilot is not required for a flight director, it merely shows the pilot what an autopilot would be doing if it was installed /engaged which is useful guidance to the pilot when flying manually. An autothrottle is not required as the flight director only gives pitch and bank angle advice to the pilot to achieve the desired performance. The energy must be managed to the pilot using manual thrust or an autothrottle but this does not affect the functioning of the flight director.
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