Which of these conditions satisfy realizability?

• A. (- rho overline{u_{i}^{ } u_{j}^{ }} )<1
• B. (- rho overline{u_{i}^{ } u_{j}^{ }} )>1
• C. (- rho overline{u_{i}^{ } u_{j}^{ }} )>0
• D. (- rho overline{u_{i}^{ } u_{j}^{ }} )<0