Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_11 (name VARCHAR, presentation_of_credentials VARCHAR)
### Question:
Who presented their credentials at an unknown date?
### Answer:
SELECT name FROM table_name_11 WHERE presentation_of_credentials = "unknown"