The Deen Dayal Upadhyaya Gram Jyoti Yojana aims to:

Provide electricity to all villages in Bihar
Promote solar power in rural areas
Improve the reliability of power supply
All of the above

The Deen Dayal Upadhyaya Gram Jyoti Yojana (DDUGJY) is a government of India scheme launched in 2015 to provide electricity to all villages in India. The scheme aims to provide 24×7 electricity to all households in rural areas, improve the reliability of power supply, and promote solar power in rural areas.

The scheme has been implemented in two phases. The first phase, which was launched in 2015, focused on providing electricity to all villages that were not connected to the grid. The second phase, which was launched in 2017, focuses on improving the reliability of power supply and promoting solar power in rural areas.

The DDUGJY has been successful in providing electricity to all villages in India. As of March 2019, 100% of villages in India have been electrified. The scheme has also been successful in improving the reliability of power supply. As of March 2019, the average outage duration in rural areas has been reduced to 1.5 hours per day.

The DDUGJY has also been successful in promoting solar power in rural areas. As of March 2019, over 1.5 million solar power connections have been provided to households in rural areas. The scheme has also helped to create over 100,000 jobs in the solar power sector.

The DDUGJY is a successful scheme that has helped to improve the lives of millions of people in rural India. The scheme has provided electricity to all villages in India, improved the reliability of power supply, and promoted solar power in rural areas.

The correct answer to the question is: d) All of the above.