Answer:
A, D and E are the answers that apply
Step-by-step explanation:
A applies because before leaving the EU, the United Kingdom had to go through a lengthy process that took over three years. The United Kingdom finally completed the process in January of 2020.
D applies because in effect, Israel, India, and Pakistan have nuclear weapons and refused to sign the treaty.
E applies because before the exit of the UK, the EU had 28 members. It currently has 27 member nations (after the exit of the United Kingdom).