What type of document provides external validation of a candidate's suitability for a role?

The correct answer is that a reference provides external validation of a candidate's suitability for a role. A reference is typically a statement or recommendation from a previous employer, colleague, or professional contact who can vouch for the candidate's skills, work ethic, and overall performance. This external perspective is valuable for potential employers during the hiring process as it offers insight into how the candidate has performed in past roles and whether they would be a good fit for the new position.

In contrast, a resume lists a candidate's skills, experience, and qualifications, but it is crafted by the candidate themselves and may not provide an unbiased view. A job description outlines the responsibilities and requirements of the role itself, serving as a guide for both the employer and the candidate to understand the position's expectations. A cover letter is a personalized document that accompanies a resume, where the candidate can explain their interest and reasoning for applying, but like the resume, it is not an external validation of their capabilities. Thus, the reference stands out as the document that provides third-party verification and credibility regarding a candidate's qualifications.