TDS deducted under section 194JB

A consultant engaged by a private limited company has had TDS deducted at 10% under Section 194JB. They are seeking clarification on eligibility for Presumptive Tax under Section 44ADA, especially given they also received salary income from a previous employer in the same financial year. The core question is whether to file ITR 3 or ITR 4, and what business code to use for professional services.