Where is the rank rank 3 in Megaman 3

After getting Rank 7, Chaud e-mails you about a message on the ACDC BBS. Check it out. Then, go to Undernet 4 at the bottom of the slope. The entrance to Undernet 4 is through Undernet 2. Search long enough and you'll find it. At the bottom of the slope you'll enter a cutscene. Defeat Gutsman Beta and receive Rank 3.