The Nuclear Muscle of North Korea

1) Recently, the North Korea conducted its fifth nuclear test which has escalated tensions across the world. Which of the following statements is/are correct in this regard?

a) The test had an estimated yield of 10-20 kt.
b) The test had a magnitude of tremor or the energy yield of 5.3 .
b) The country has also demonstrated the technology of miniaturizing nuclear weapons to the point of attaching them to ballistic missile.
d) All of the above

Answers

1) d