Answer:
In regards to a cover letter key, some key protocol must not be violated, a cover letter must be addressed to a person— the writer should not use "To whom it may concern." In case you do not have a name to address the letter to, then address it to a title—For instance as "dear hiring committee" or "dear Human Resources director."
Step-by-step explanation:
A cover letter must have an opening concise statement, which includes the exact title of the job candidate is applying for.
A cover letter must address each item that is included in the job ad page.