What document should be tailored specifically to each job application to highlight relevant skills?

The correct response is a cover letter, as it allows applicants to specifically address the job they are applying for and the unique skills that make them a strong match for that position. A well-crafted cover letter complements a resume by providing a narrative that connects the applicant's experiences and strengths directly to the job description. This customization demonstrates to potential employers that the applicant has taken the time to understand the role and can articulate how their background aligns with the company's needs.

In contrast, a resume offers a more general overview of an applicant's work experience and skills, which may not always highlight the most relevant qualifications for each specific role. While a work permit is necessary for legal employment in certain jurisdictions, it does not relate to the personal qualifications for the job. A job posting is a description created by employers to outline the requirements and responsibilities of a position, rather than a document that job seekers create or personalize.