Explanation:

- Sajan Prakash became the first Indian swimmer to achieve the Olympic Qualification Time (A cut) in June 2021. He accomplished this feat at the Sette Colli Trophy in Rome.

- Srihari Nataraj is also an accomplished Indian swimmer who has achieved the Olympic B qualifying mark.

- Anand Anilkumar Shylaja is not notably known in the international swimming circuit as of my last update.

- Virdhawal Khade is another prominent Indian swimmer, but he was not the one to first breach the Olympic A qualification time in 2021.