Who was the visiting team on weeks under 12 and at Sports Authority Field at Mile High?
CREATE TABLE table_68077 (
    "Week" real,
    "Date" text,
    "Visiting Team" text,
    "Final Score" text,
    "Host Team" text,
    "Stadium" text
)
SELECT "Visiting Team" FROM table_68077 WHERE "Week" < '12' AND "Stadium" = 'sports authority field at mile high'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Who was the visiting team on weeks under 12 and at Sports Authority Field at Mile High? ### Input: CREATE TABLE table_68077 (
    "Week" real,
    "Date" text,
    "Visiting Team" text,
    "Final Score" text,
    "Host Team" text,
    "Stadium" text
) ### Response: SELECT "Visiting Team" FROM table_68077 WHERE "Week" < '12' AND "Stadium" = 'sports authority field at mile high'