Final answer:
YAML, which stands for YAML Ain't Markup Language, is a human-readable data serialization language that maps configurations into a readable format.
Step-by-step explanation:
Commonly known as YAML, which stands for YAML Ain't Markup Language, this data serialization language easily maps configurations into a format that is easy to read for humans. Therefore, the correct answer to the question is B. YML, configurations, format. YAML is particularly popular in configuration files and data exchange applications between different programming languages due to its human-readable nature and its ability to represent complex data structures in a straightforward manner.