Step 1: Understanding the Concept:
"Arka" is the prefix used for vegetable and crop varieties developed by the Indian Institute of Horticultural Research (IIHR), Hessaraghatta, Bangalore.
Step 3: Detailed Explanation:
1. Arka Garima is an improved, high-yielding variety of cowpea (Vigna unguiculata) developed by IIHR, Bangalore.
2. It is characterized by its resistance to rust disease, and produces long, tender, light-green pods suitable for vegetable purposes.
3. It performs well in both kharif and rabi seasons.
Therefore, Arka Garima is a cowpea variety.
Step 4: Final Answer:
The correct option is 1, which corresponds to Cowpea.