16. Data sent do not match the data received due to noisy channelGroup of answer choicesNoiseError correctionError detectionError

In communication systems, when data sent does not match the data received due to a noisy channel, the situation is typically addressed through error detection and error correction techniques. Here’s a breakdown of the options provided:

1. Noise: This refers to any unwanted interference in a communication channel, which can corrupt the original data.

2. Error Detection: This is a technique that identifies whether errors have occurred during the transmission. However, it does not correct the errors; it merely flags the fact that there's an issue.

3. Error Correction: Error correction not only identifies that there are errors but also includes methods to correct them. This allows the receiver to recover the original data even when some bits have been corrupted.

4. Error: This is a general term that describes any deviation from the intended data.

Given the context of data not matching due to a noisy channel, the most relevant concepts would be Error Detection and Error Correction. However, since the problem implies that the purpose is to address the fact that the data does not match (indicating an issue after transmission has occurred), the direct purpose of determining that mismatch aligns primarily with Error Detection.

Final Answer

The best choice in the given context is Error Detection.