Apols if asked before. I am the main applicant for a 47PA. my wife of 42 yrs is the second named person. Our son, soon to be 40 is/will be our sponsor. In Q13 it asks for details of any previous visas. we have only visited Australia under an ETA which is, as far as I can find is NOT a Visa, Should I answer the question as NO or UNSURE?