Final answer:
The cover letter (option A) is the tool that conveys an effective sales message when accompanying a product. It should focus on the company's needs and demonstrate how the applicant can be an asset, thereby 'selling' the applicant efficiently.
Step-by-step explanation:
An effective sales message may be conveyed by the cover letter when it accompanies the product. When writing letters of application and résumés, it is essential to present information in a way that persuades the reader of your value to the company. You should focus on how you can be an asset to the employer by addressing their needs and demonstrating how you meet the specified criteria for applicants.
To effectively 'sell' yourself, consider what the employer is looking for and how you can fulfill that. Ask questions such as 'What can you do to fill a present or future need?' and 'How can you show you fulfill the criteria the employer is looking for?'