A developer is experiencing issues with a Lightning web component. The component must surface information about Opportunity owned by the currently logged-in user.
When the component is rendered, the following message is displayed: ''Error retrieving data''
Which modification should be implemented to the Apex class to overcome the issue?

A developer wants to create a Visualforce page that allows a user to search for a given account by Name. If the account is found, the account details should be populated on screen. If no account is found, an error message should be displayed to the user.
How can this be accomplished? (Choose two.)

A developer sees test failures in the sandbox but not in production. No code or metadata changes have been actively made to either environment since the sandbox was created.
Which consideration should be checked to resolve the issue?

Which tag should a developer use to display different text while an <apex:commandButton> is executing versus not executing?

Universal Containers wants to be able to bring up an Account detail page and view a table of containers currently being rented. The user wants to be able to dick on a container In the table and quickly edit and save the location of the container.
In addition to this, the page should have a section that shows the location of each container on a map. Universal Containers wants the map to re-render whenever the location of a container is changed.
What can a developer use to accomplish this task?