Final answer:
The letter 'T' is used to express appreciation for the employer's interest in an applicant.
Explanation:
The letter used to express appreciation for the employer's interest in an applicant is the letter 'T'. Sending a thank-you letter after an interview is an important step in the job search process as it conveys professionalism and gratitude.
Learn more about Expressing appreciation for employer's interest in an applicant here:
https://brainly.com/question/32670086
