As data enters the indexer, it proceeds through a pipeline where event processing occurs.

 Line breaking is the process of splitting the incoming stream of data into separate lines based on a regular expression. Line breaking occurs in the parsing pipeline, which is one of the pipelines that data goes through as it enters the indexer. The parsing pipeline is responsible for extracting metadata, such as source, sourcetype, host, timestamp, and index, as well as breaking events into lines and merging lines into events. Therefore, the correct answer is D, parsing. References :=

How indexing works

Configure event line breaking