Read this: On February 17, 2010, AF1 announced it would use the "Arena Football League" name. The league announced plans for the upcoming season and details of its contract with NFL Network to broadcast AFL games in 2010. AF1 teams were given the option of restoring historical names to their teams. In addition to the historical teams, the league added two new expansion franchises, the Dallas Vigilantes and the Jacksonville Sharks.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): Along with the Dallas Vigilantes, what expansion team was announced in 2010?
Jacksonville Sharks