Step 1: Understanding the Concept:
Dynamic web pages are generated in real-time by a server-side application. The workflow follows the client-server request-response cycle.
Step 2: Detailed Explanation:
1. D (HTTP request): Client sends a request to the server.
2. B (An Application program handles HTTP requests): Server receives the request and triggers the application program.
3. C (The program executes and produces HTML output): Server-side code processes logic and generates dynamic HTML.
4. A (HTTP response): The generated HTML is sent back as the HTTP response to the client.
Step 3: Final Answer:
The correct order is D, B, C, A.