Which action can a developer take to reduce the execution time of the following code?

A developer declared a class as follow.
public class wysiwyg { // Properties and methods including DML }
Which invocation of a class method will obey the organization-wide defaults and sharing settings for the running user in the Salesforce Organization?

A developer has the following trigger that fires after insert and creates a child Case whenever a new Case is created. List<Case> childCases = new List<Case>();for (Case parent : Trigger.new){Case child = new Case (ParentId = parent.Id, Subject = parent.Subject);childCases.add(child);}insert childCases; What happens after the code block executes?

A developer needs to update an unrelated object when a record gets saved. Which two trigger types should the developer create?

A developer writes the following code:

What is the result of the debug statement?