Explanation:

- The Indian Army commissioned its first batch of women soldiers in the year 2021.

- A significant step, this was part of the initiative to increase gender inclusivity in the armed forces.

- These soldiers were trained under rigorous conditions at various training centers.

- Option 1: 2020 - Incorrect. This was the year when the training process for the first batch commenced.

- Option 2: 2022 - Incorrect. By this year, the second batch was expected to be in training or commencing.

- Option 3: 2021 - Correct. The first batch was commissioned in 2021 after undergoing training.

- Option 4: 2023 - Incorrect. By now, multiple batches have likely been commissioned.