Which of the following multilateral forums in India is a member of along with USA, Australia and Japan?

QUAD

***The correct answer is Option 3 - QUAD***

The multilateral forum that India is a member of along with the USA, Australia, and Japan is the Quadrilateral Security Dialogue, commonly known as the Quad. It's a strategic forum that aims to promote a free, open, and inclusive Indo-Pacific region.
The Quad was initially formed in 2007 but didn't continue past 2008. It was then re-established in 2017. The Quad's main objective is to create a free, open, prosperous, and inclusive Indo-Pacific region. They achieve this through talks, summits, information sharing, and joint military exercises.

Other options:

The South Asian Association for Regional Cooperation (SAARC) consists of eight member countries:
Afghanistan, Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan and Sri Lanka

The Shanghai Cooperation Organisation (SCO) has eight member countries:
China, India, Kazakhstan, Kyrgyzstan, Pakistan, Russia, Tajikistan and Uzbekistan

The Association of Southeast Asian Nations (ASEAN) consists of ten member countries:
Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar (Burma), Philippines, Singapore, Thailand and Vietnam