Application Events follow the traditional publish-subscribe model. Which method is used to fire an event?

What is the value of x after the code segment executes?String x = 'A';Integer i = 10;if ( i < 15 ) {i = 15;x = 'B';} else if ( i < 20 ) {x = 'C';} else {x = 'D'; }

A developer wants multiple test classes to use the same set of test data.
How should the developer create the test data?

A developer can use the debug log to see which three types of information? (Choose three.)

A company has a custom object named Region. Each account in salesforce can only be related to one region at a time, but this relationship is optional. Which type of relantionship should a developer use to relate an account to a region?