A developer uses the call() instance method of dw.svc.Service to invoke a web service and implemented the callback methods defined by the dw.avc.ServiceCaliback class.
Which callback method is required only when invoking a SOAP service?

A Digital Developer suspects a logical error in a script.
Which action will help locate the error?

Universal Containers recently completed updates to their storefront shopping cart page. A problem has been discovered since the update. Users are no longer able to submit coupon codes on this page. Additionally, authenticated users who try to add a coupon are logged out.
The following processing code is found in the Cart.js controller file:

What should the Developer verify to identify the issue?

A developer uses hooks for an extension point. Which n true for running multiple hooks for an extension point?