The correct answer is: A. Harwan Garden
Harwan Garden is a Mughal garden located in the foothills of the Zabarwan Range in Srinagar, Jammu and Kashmir, India. It is one of the oldest surviving Mughal gardens in the Indian subcontinent. The garden was built in the 17th century by the Mughal emperor Jahangir for his wife Noor Jahan. It is a rectangular garden with a central water channel that divides it into four equal parts. The garden is surrounded by a high wall and has four gates, each of which is decorated with intricate tile work. The garden is home to a variety of plants and trees, including cypress, pine, and deodar. It is also home to a number of birds and animals, including peacocks, parrots, and deer.
Harwan Garden is a popular tourist destination and is a UNESCO World Heritage Site. It is open to the public from sunrise to sunset.
The other options are incorrect because:
- B. Shalimar Bagh is another Mughal garden located in Srinagar. It is not the gateway to Dachigam Wildlife Sanctuary.
- C. Nishant Bagh is a Mughal garden located in Jammu. It is not the gateway to Dachigam Wildlife Sanctuary.
- D. None of the above is not the correct answer.