Explanation
REGEX is a function that allows administrators to check whether a text value matches a regular expression pattern. Regular expressions are a way to define complex patterns of characters using symbols and operators.
REGEX can be used to enforce consistent formatting for a field value by specifying the required length, characters, and separators.

Explanation
When a currency is added to an organization's list of supported currencies, it cannot be deleted and once enabled, advanced currency management cannot be disabled are two considerations that AW Computing should be aware of prior to implementing this change to the existing system. Adding a currency to an organization's list of supported currencies is an irreversible action that allows users to enter and view amounts in that currency for standard and custom objects that have currency fields. Enabling advanced currency management is also an irreversible action that allows administrators to define dated exchange rates for opportunities and opportunity products based on close dates or product dates instead of using static conversion rates

Explanation
The PARENTGROUPVAL function is a formula function that returns the value of a parent group in a report.
It can be used to compare values across different groupings and show relative performance. In this case, the administrator can use this function to show the lead source effectiveness for each country by calculating the percentage of leads from each lead source divided by the total number of leads for each country. References:
https://help.salesforce.com/s/articleView?id=sf.reports_formulas_parentgroupval.htm&type=5

Explanation
The Setup Audit Trail is a tool that allows you to view and download a log of changes made in your org's Setup area. The log shows up to 20 fields of information for each change, such as who made it, when it was made, what type of change it was, and what values were changed. You can use the Setup Audit Trail to track configuration changes directly in production and identify any unauthorized or problematic changes. One of the changes that the Setup Audit Trail tracks is when a user's profile is changed and who changed it. This means that you can use the Setup Audit Trail to see when a user's profile has been changed and who changed the data. References: https://help.salesforce.com/s/articleView?id=sf.monitorsetup.htm&type=5

Explanation
Territory management is a feature that allows you to grant access to accounts and opportunities based on criteria such as geography, industry, product line, or customer size. A territory is a grouping of accounts and users that represents a market segment or business unit. In this case, the administrator should utilize territory management to add the operations team to the East territory, which contains all the accounts and opportunities in the East region. This way, the operations team members can access all the records in their territory regardless of who owns them or what the organization-wide default is. References:
https://help.salesforce.com/s/articleView?id=sf.territories_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.territories_define.htm&type=5