A merchant requires the ability to configure contact information for their brick and mortar stores as a CSV file upload. The module already exists and contains an etc/adminhtml/system.xml file where the new field can be added.
How do you specify the class that will process the uploaded file?

You have added a new attribute origin of the type varchar to the product entity.
Which two calls will filter a product collection with origin set to "California"? (Choose two.)

A custom module must make changes to the schema following each setup:upgrade run. This must be done after all other module's schema updates have been applied.
How is this accomplished?

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.)

In a custom module you are adding a new field to the store configuration. The field will set the value for the configuration path mycompany/mymodule/myoption.
How do you supply the default value for that configuration option?