Answer:
The correct answers are letters "D" and "E": Separately; At your request.
Explanation:
Business writing must be clear, concise, and objective. Most business messages are addressed to top managers who do not have the time to be asking for grammar clarifications in reports. Thus, hidden verbs, redundancy, wordy and stale expressions or exuberance must be avoided.
Fresh, vigorous expressions include "Separately", "About", "Enclosed is", "At your request", "Please" or "Thank you".
