Step 1: Understanding the staffing process.
- (D): The first step is determining the number of personnel required for the vacant positions. This is necessary before beginning the hiring process.
- (A): Next, searching for employees and stimulating them to apply comes next. After determining the need, you look for suitable candidates.
- (B): Once candidates are selected, the next step is issuing the offer letter to finalize the hiring.
- (C): Lastly, a brief presentation about the company is given to the selected candidates.
Step 2: Conclusion.
The correct sequence is:
(D), (A), (B), (C).
Final Answer:
\[
\boxed{\text{The correct answer is (3) (D), (A), (B), (C).}}
\]