You are tasked with ensuring customers who log into the site are authorized. By default, this consists of
ensuring the customers email and password match the values in the database. On this project, you need to
verify additional data in this process.
Keeping in mind upgradeability, how is this done?

Assume that $collection is a new instance of a class that extends
Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection, and $ids is an array of ids.
How do you select a list of records from the database where the record ids are in the $ids list?

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?

How many shipping addresses may be selected for an order during the checkout process?

What are two functions of a resource model? (Choose two.)