How many countries are the members of AUKUS pact that was formed on 15 September 2021?

A. 3

B. 4

C. 5

D. 6

Detail:

AUKUS, also styled as Aukus, is a trilateral security pact between Australia, the United Kingdom and the United States, announced on 15 September 2021 for the Indo-Pacific region. Under the pact, the US and the UK will help Australia to acquire nuclear-powered submarines. The pact also includes cooperation on "cyber capabilities, artificial intelligence, quantum technologies and additional undersea capabilities". Under the pact, Australia will acquire new long-range strike capabilities for its air force, navy and army. The pact will focus on military capability, separating it from the Five Eyes intelligence-sharing alliance that also includes New Zealand and Canada.