Which string of characters is used to identify the beginning of a new separate document when multiple documents are in a single YAML file?

Which string of characters is used to identify the beginning of a new separate document when multiple documents are in a single YAML file?

• three slashes "///"
• three dots "..."
• three pound signs "###"
• three dashes "---"

Explanation: YAML files conventionally open with three dashes ( --- alone on a line) and end with three dots ( ... also alone a line). YAML also accommodates the notion of multiple "documents" within a single physical file, in this case, separating each document with three dashes on its own line.
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