A personal business letter is "Addressed to a person whom you already know" (Option D)
The purpose of a personal business letter is to convey formal, written communication to someone with whom you have a pre-existing relationship.
This type of letter serves various functions, such as expressing gratitude for a favor, updating a contact on personal or professional matters, making specific requests, or conveying important information in a formal manner.
It aims to maintain and strengthen relationships, provide clear and documented communication, and demonstrate professionalism in business or personal interactions.
Full Question:
Although part of your question is missing, you might be referring to this full question:
A personal business letter is:
Addressed to a new business contact
Addressed to someone within your office
Addressed to your supervisor
Addressed to a person whom you already know