You have data saved in the following format. Which format was used?

YAML uses indentation-based hierarchical key-value pairs and is typically used for configuration files, not tabular row-and-column data.

CSV is a flat, text-based format that stores tabular data as rows of values separated by a delimiter (typically a comma). It is one of the most widely used formats for data exchange due to its simplicity and human readability, though it lacks built-in support for data types, nested structures, or compression.

JSON uses curly-brace objects and square-bracket arrays to represent nested, hierarchical data structures, which is visually distinct from the flat row/column structure of CSV.

HTML uses angle-bracket tags to mark up content for web browsers and is not a data serialization or tabular data format.