Explanation:

All statements are correct.

Recently, NITI Aayog’s Atal Innovation Mission & Commonwealth Scientific and Industrial Research Organisation kick-start the India-Australia Circular Economy (I-ACE) Hackathon, 2021.

• Goal of the hackathon: to enable talented innovative students and start-ups from Australia and India to address common national issues through innovative technology solutions.

Conducted by: Atal Innovation Mission (AIM) and Australia’s national science agency (CSIRO).

• I-ACE is supported by the Australian Department of Industry, Science, Energy and Resources (DISER), AIM Atal Incubation Centre network, and various domain experts.
• A 'circular economy' model, which employs not only waste management, but reuse, recycling and responsible manufacture can support the development of new industries and jobs, reducing emissions and increasing efficient use of natural resources.

The four key themes for the hackathon are as follows

• Innovation in packaging reducing packaging waste
• Innovation in food supply chains avoiding waste
• Creating opportunities for plastic waste reduction
• Recycling critical energy metals and e-waste

Hence option 4th is correct.