What are the correct conditions for the validity of a talaq (divorce)?

Someone from an Arab country asked Huzoor^aa:

…

2. what the correct conditions for the validity of talaq were…

Huzoor^aa, in a letter dated 14 January 2020, gave the following reply: 

2. “The conditions for [the validity of] talaq are that if a man divorces his wife out of his own volition whilst being fully conscious, whether verbally or as a written statement, the divorce becomes effective in both cases.”