A merchant asks you to extend customer functionality to allow customer accounts to be associated with two or more billing addresses.
How is this implemented?

A merchant asks you to extend customer functionality to allow customer accounts to be associated with two or
more billing addresses.
How is this implemented?

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

A merchant tasked you to add an input field for notes to the Customer Account Information backend page.
Which three actions do you specify in a module's Data Patch to add a customer notes attribute? (Choose
three.)

You are adding a new menu item to the admin backend which will link to a custom backend page.
The declaration of the route:

What do you specify as the menu item action attribute value so it links to /admin/mycompany/mymodule/?