What are the limitations of Schema Builder when creating a custom object?

Schema Builder can create custom objects, relationship fields, formula fields, and normal fields, but a key limitation is that fields created through Schema Builder are not automatically added to the object’s page layout. The app builder must go to the page layout separately and place the fields where users need to see them. Salesforce Trailhead confirms Schema Builder supports relationship fields, formula fields, and normal fields, so option B is incorrect. Salesforce Help also notes that fields added through Schema Builder are not automatically added to the page layout.