Read the following passage and answer the following questions.

The First Nuclear explosion was undertaken by India in 1974, our first PM had always put faith in science and technology for rapidly building a modern India. A significant component India's industrialisation plans was the nuclear programme initiated in the late 1940s under the guidance of Homi J. Bhabha

When communist China conducted nuclear test in 1964 the permanent members of the UN Security Council-tried to impose the Nuclear Non-proliferation Treaty (NPT) of 1968. India always considered the NPT as discriminatory and had refused to sign it, and also further refused to sign the CTBT.

When India conducted its first nuclear test, it was termed as peaceful explosion. Later India conducted a series of tests, Pakistan soon followed. India Nuclear doctrine of credible minimum nuclear deterrence professes "No first use."

Name the four countries who have not signed the Nuclear Non-Proliferation Treaty.

India, Pakistan, North Korea and Israel

***The correct answer is Option 3 - India, Pakistan, North Korea and Israel***

There were four countries considered nuclear-armed states that had not signed the Nuclear Non-Proliferation Treaty (NPT). These countries are:

India
Israel
Pakistan
North Korea