Consider the following code snippet:

A developer needs to built an interactive Aura component that responds to the user's input by hiding or showing sections according the user preferences.
What are two best practices the developer can implement to hide or show the powerVserView and s-rar.daraVserView inner components, based on the value of the attribute isPowexUser?
Choose 2 answers
A)

B)

C)

As part of a custom development, a developer creates a Lightning component to show how a particular opportunity progresses over time. The component must display the date stamp when any of the following fields change:
* Amount, Probability, Stage, or Close Date
How should the developer access the data that must be displayed?

ABC Company has an Apex process that makes multiple extensive database operation and web service callouts. The database processes and web services can take a length time to run and must be run sequentially.
How should the developer write this Apex code without running into governor limits and system limitations?

A company has many different unit test methods that create Account records as part of their data setup. A new required field was added to the Account and now all of the unit tests fail. What is the optimal way for a developer to fix the issue?

How should a developer verify that a specific Account record is being tested in a test class for a visualforce controller?