Answer whether the sentence above is true or false and state in detail why.

1. If the optimal solution of primal problem is degenerate solution, then the complementary dual solution is also degenerate solution. 2. If the primal problem has feasible solution and unbounded optimal function, the dual problem can have a feasible solution when changing the right-hand-side value of this problem. 3, If the primal problem has unbounded solution, this problem has a finite optimal solution when changing some of the right-hand-side values