Answer:
This style of writing is effective because:
The writer specifically indicates the vacant position (customer service representative) and the media (company's website) from which the vacancy information is obtained.
Step-by-step explanation:
The first paragraph of an effective application letter should make reference to the subject under discussion. It is also proper for the applicant to indicate how she obtained the information for her application. The reference demonstrates that the applicant had done her background study and is also applying to fulfill the company's requirements.