D1 opponents per NCAA rules.
http://www.sportingnews.com/us/ncaa-basketball/news/ncaa-rule-on-secret-division-i-basketball-practices-hiding-from-public-media/knl7w0iuxjhyzk0ix7iwzb2y
According to NCAA rules passed in 2005, Division I members can trade one or both of their allotted exhibition games against non-D-I opponents for a scrimmage “provided they are conducted in privacy without publicity or official scoring. Individuals other than athletics department staff members and those necessary to conduct a basketball scrimmage against outside competition may not be present during such a scrimmage.”