Refer to the exhibit.

YAML (YAML Ain't Markup Language):The snippet provided uses indentation (whitespace) to denote structure and colons to separate keys from values. This is the signature syntax of YAML.

RAML Context:MuleSoft'sRAML (RESTful API Modeling Language)is built on top of YAML1. Therefore, any RAML specification is technically a YAML file.

Why others are incorrect:

JSON:Uses curly braces {} and quotes "" strictly.

XML:Uses angle brackets .

CSV:Uses comma-separated values.