A company has a custom object. Request__c. that has a field, Completed__c. and a Lookup to Opportunity, Opportunity__c.
Which SOQL query will get a unique list of all of the Opportunity records that have a Completed Request?

What is a technique to maximize code re-use within Visualforce pages? Choose 3 answers

Universal Containers needs to integrate with their own, existing, internal custom web application. The web application accepts JSON payloads, resizes product images, and sends the resized images back to Salesforce.
What should the developer use to implement this integration?

A Visualforce page contains an industry select list and displays a table of Accounts that have a matching value in their Industry field.

When a user changes the value in the industry select list, the table of Accounts should be automatically updated to show the Accounts associated with the selected industry.
What is the optimal way to implement this?

Which of the following about Dynamic Apex is incorrect?