Custom storefront scripts arecode artifacts, not Business Manager metadata objects. Consequently, among the supplied options, B is the technically correct first step: create or define the required JavaScript/CommonJS script module within the project code structure.
Salesforce documents that B2C Commerce script modules are.js,.ds, or.jsonfiles and are normally stored in cartridges, commonly undercartridge/scripts. Modules expose public functionality throughexportsand are loaded withrequire(). Controllers and other server-side components can then import and invoke that reusable module.
Business Manager does not provide a general mechanism for creating arbitrary SFRA application scripts. Business Manager manages configuration, metadata, jobs, services, catalogs, and related platform data; deployable application logic belongs in cartridges/code versions.
Option C is less precise because the script/module itself must first be established in the codebase before its exported behavior can be consumed.
Study Guide reference:Application Development — CommonJS modules,cartridge/scripts, JavaScript modules,require(), exports, and cartridge-based application code.
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