Step 1: Understanding the data type.
The question involves audio, images, and videos, which do not follow a fixed structure like tables or databases.
Step 2: Types of Big Data.
• (A) Structured Data: Organized in tables with rows and columns.
• (B) Semi-Structured Data: Has partial structure (like XML or JSON).
• (C) Unstructured Data: Correct. Includes audio, images, and videos without predefined format.
• (D) Filter Data: Not a recognized category of Big Data.
Step 3: Conclusion.
Hence, the analyst is dealing with unstructured data.
Final Answer: Unstructured Data.