To conduct a successful search using unknown or wildcard terms, the operator you should use is the asterisk (*) symbol. This symbol acts as a placeholder for any unknown terms or phrases.
However, among the options you've provided, it seems that the correct wildcard operator isn't listed. The most common operator for including wildcards in a search is "*", which is used in many search engines to represent any string of characters.
In your context, check if there's any specific guidance for the platform you are using for searches, as it may vary. If you aim to refer to something specific from the list provided (like "site:") please clarify for further assistance.
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