Which ITR form to be used

This discussion addresses the correct Income Tax Return (ITR) form for a client with freelance income solely from CCTV installation and repairs. The user mistakenly filed ITR 1 but realised ITR 3 might be more appropriate as it's for business income. They are seeking advice on whether they can file ITR 3 without e-verifying the initial ITR 1 submission, especially for the financial year 2019-20.