Which code sample is required to use a custom tag provided in SiteGenesis in an...

To use a custom tag defined in SiteGenesis within an ISML template, the correct code snippet is Option B: <isinclude template="util/customtags"> This ISML tag includes the custom tag definitions from the specified template into the current template, making the custom tags available for use within the template. This method follows the best practice in ISML template development for reusing common functionality defined in separate templates, as outlined in the Salesforce B2C Commerce ISML template documentation and guidelines.