Short Answer 
The phrase “revealed by” signifies information that can be inferred through interpretation rather than directly stated. Correct options emphasize the need for readers to deduce classified information, while incorrect ones focus on expertise rather than the interpretative process.
Step 1: Understanding the Concept of “Revealed By”
The phrase “revealed by” refers to information that is not directly mentioned in a document but can be understood through analysis. This means that readers need to engage in deeper thinking and interpretation to uncover this information. Such classified details require the reader to deduce meanings that are only implied rather than explicitly stated, enhancing the complexity and depth of understanding required.
Step 2: Identifying Correct Options
When analyzing the options provided, it is crucial to focus on those that properly align with the concept of “revealed by.” The correct options highlight key aspects:
- a: Emphasizes that readers can deduce classified information through additional interpretation.
- c: Points out that classified information is not clearly stated in the source document but can be inferred.
Step 3: Clarifying Incorrect Options
In addition to identifying the correct answers, it’s important to recognize why the other options don’t fit. For instance, options b and d focus on expertise and training rather than the interpretative process of revealing information. Understanding these distinctions helps clarify the criteria for identifying what is truly “revealed by.”