Which statement about data framing best describes its purpose?

• A. To perform data encryption at the physical layer.
• B. To increase data rate by skipping headers.
• C. To store data in long-term archives.
• D. To define packet boundaries, enable synchronization, and detect errors.

Answer: (D)

Framing packages data for transmission in a way that makes the stream understandable at the receiving end. It defines where each unit starts and ends, so the receiver can identify individual packets reliably. It also provides synchronization, helping the receiver align to the actual data stream even if timing shifts occur, usually through preambles or start/stop indicators. Plus, it includes error-detection information (like a CRC) so the receiver can verify that a frame arrived without corruption and detect when something went wrong.

These elements—clear boundaries, proper synchronization, and error checking—are the core reasons framing exists. The other options don’t fit: encryption at the physical layer is about security, not how data is framed; skipping headers would remove essential framing information and actually hinder interpretation; storing data in long-term archives relates to storage, not transmission framing.