A module MyModule needs to send notifications to customers only when the account was modified from a mobile app using the REST web APIs.
You decided to implement an observer for customer_save_after_data_object event.
In which file do you declare the observer?

How do you pass an array ['one', 'two] as a parameter to you block using the layout XML arguments directive?

Which three scopes can be used to set different System Configuration values in Magento? (Choose three.)

A module you are developing requires the addition of new routes that should be accessible in the store front.
Where do you define your module's frontName?

You have created a module with a custom ACL resource and want to restrict access to resources of your module.
Which three items are restricted based on ACL role permissions? (Choose three.)