In a VisualForce page with a VisualForce component that has rendered set to false when the page loads, how can a developer ensure it will show on a re-render?

Universal Containers needs to integrate with a Heroku service that resizes product images submitted by users.
What are two alternatives to implement the integration and protect against malicious calls to the Heroku app's endpoint? Choose 2 answers

Given a list of Opportunity records named opportunityList, which code snippet is best for querying all Contacts of the Opportunity's Account?
A)

B)

C)

D)

A developer is building a Lightning web component to get data from an Apex method called getData that takes a parameter, name. The data should be retrieved when the user clicks the Load Data button.
Exhibit.

What must be added to get the data?

The test method above calls a web service that updates an external system with Account information and sets the Account's Integration_Updated__c checkbox to True when it completes. The test fails to execute and exits with an error: "Methods defined as TestMethod do not support Web service callouts. " What is the optimal way to fix this?