Define the script in the OmniScript Designer (D) – The first step in creating an OmniScript is to define it in the OmniScript Designer, where the consultant:
Outlines the flow of the script (steps, inputs, actions).
Adds UI elements (text fields, picklists, buttons).
Configures integration points (DataRaptors, Integration Procedures).
A. Create a new Salesforce application for the script – This is not required to build an OmniScript. OmniScripts can be deployed within existing Salesforce applications.
B. Deploy the script within a Salesforce application – Deployment happens after the script is built and tested, not as the first step.
C. Test the script on multiple channels and devices – Testing is an important step after building and configuring the script.
Comprehensive and Detailed In-Depth Explanation:Why not the other options?? Salesforce OmniStudio Reference:
OmniScript Designer Guide
Creating OmniScripts