Which ones in the following are correct about the writing of application letters for jobs?
A.
The only one purpose of the letter lies in proving that the applicant is qualified or excellent to take a certain job.
B.
All the information in the letter should be closely related to the job objective.
C.
The letter should be written no more than 1 piece of A4 paper with many paragraphs in order to save the readers' time and energy.
D.
If the applicant is excellent enough, it is unnecesary for him to show his respect to the readers(employers, HRs, etc.) in the letter.