An experimental drug (SD27C) is being studied. This novel drug delivers insulin via the intranasal route. Diabetic participants who are taking insulin as their current treatment regimen are asked to participate in a clinical trial. This trial involves 1,000 patients who have given informed consent and are divided into 2 groups, and a double-blind clinical trial is conducted. Both groups receive an intranasal inhalation and an injection, but the group that receives the active drug in the inhalation gets saline in the injection. One group receives the new formulation (SD27C), while the second group receives regular insulin via subcutaneous injection. The results show that the treatment outcomes in both groups are the same. SD27C is currently under investigation in which phase of the clinical trial?A.Phase IVB.Phase IIIC.Post-market surveillanceD.Phase IIE.Phase I