Final answer:
The internal inputs of an IR system are components that directly participate in information processing within the system. User queries and search algorithms are internal inputs, while external databases and networking protocols are not.
Step-by-step explanation:
The internal inputs of Craig's IR (Information Retrieval) system refer to the components that are directly involved in the processing and retrieval of information within the system itself. Considering the options provided:
- b) User queries - This is typically an internal input as users input queries directly into the IR system to retrieve information.
- c) Search algorithms - These are internal mechanisms of the IR system that process user queries to find relevant results.
- d) Networking protocols - While they are essential for communication between systems, they are not typically considered internal inputs specific to the functionality of an IR system.
- a) External databases - As the name suggests, these are external to the IR system and hence not an internal input.
Therefore, the correct answers are b) User queries and c) Search algorithms.