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The correct answer is option (a): 1, 2, 5 and 6 only.
This question was asked in UPSC CSE Prelims 2020, GS Paper 1, as Question 84. It falls under Environment & Ecology > Renewable Energy & Green Technologies.
This question is rated "difficult". It is a challenging question that demands deep subject knowledge and analytical thinking.
UPSC has asked 18 questions from Renewable Energy & Green Technologies (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.