Universal Containers (UC) currently does not development in its full copy sandbox.
Recently, UC has projects that require multiple developers to develop concurrently. UC is running into issues with developers making changes that cause errors In work done by other developers.
Additionally, when they are ready to deploy, many unit tests fail which prevents the deployment.
which three types of orgs should be recommended to UC to eliminate these problems?
Choose 3 answers

An org has a requirement that an Account must always have one and only one Contact listed as Primary. So selecting one Contact will de-select any others. The client wants a checkbox on the Contact called 'Is Primary' to control this feature. The client also wants to ensure that the last name of every Contact is stored entirely in uppercase characters. What is the optimal way to implement these requirements?

Part of a custom Lightning Component displays the total number of Opportunities in the org, which is in the millions. The Lightning Component uses an Apex Controller to get the data it needs. What is the optimal way for a developer to get the total number of Opportunities for the Lightning Component?

In a previous data audit, It was determined that close to 5 million Opportunity records are stored within the Salesforce environment. The organization-wide default for the object are set to Public Read-Only and most opportunities are related to an external case.
The method is called from a Lightning web component. Some end users do not provide a cased value and experience low performance while running the query.
Which two techniques should the developer implement to avoid low performance queries from executing? Choose 2 answers

A developer is creating a Lightning web component that contains a child component. The property stage is being passed from the parent to the child. The public property is changing, but the setOppList function is not being invoked.

What should the developer change to allow this?