Which of the following is NOT a part of the requirements for obtaining a driver's license?

The correct answer identifies that completing a defensive driving course is not a mandatory requirement for obtaining a driver's license. While taking a defensive driving course can be beneficial and may even provide certain advantages, like insurance discounts or points removal, it is typically not a prerequisite for acquiring the initial driver's license.

In contrast, providing proof of residency, passing a written knowledge test, and providing identification are standard requirements in most jurisdictions, including Guam. These elements ensure that the applicant is legally eligible to drive and has the necessary understanding of traffic laws and regulations. Therefore, the inclusion of a defensive driving course as a non-essential requirement is what sets it apart from the other options mentioned.