Which two combined methods should a developer use to prevent more than one open Opportunity on each Account? Choose 2 answers

How should a developer write unit tests for a private method in an Apex class?

A developer needs to test an Invoicing system integration. After reviewing the number of transactions required for the test, the developer estimates that the test data will total about 2 GB of data storage. Production data is not required for the integration testing.
Which two environments meet the requirements for testing? (Choose two.)

Universal Container(UC) wants to lower its shipping cost while making the shipping process more efficient.
The Distribution Officer advises UC to implement global addresses to allow multiple Accounts to share a default pickup address. The Developer is tasked to create the supporting object and relationship for this business requirement and uses the Setup Menu to create a custom object called "Global Address". Which field should the developer ad to create the most efficient model that supports the business need?

Which three Salesforce resources can be accessed from a Lightning web component' Choose 3 answers