Optimization of these systems involves solving an NP-hard, nonlinear mixed-integer problem with intertemporal constraints called the unit commitment problem. The equal area criterion and sets of coupled swing equations are used to analyze the transient stability of these systems. (-5[1])The robustness of components of these systems to contingencies is related to an inertia constant typically ranging from 2 to 7 seconds. (15[1])The nodal admittance matrix is used to formulate an optimal (*) flow (10[1])problem for these systems that solves balance equations for real and reactive components. In the US, droop (-5[1])speed control is used to ensure that these systems maintain a standard output frequency of 60 Hertz. (10[2]-5[2])For 10 points, a three-phase AC output is produced by what (-5[1])systems responsible for the generation, transmission, and distribution of (10[1])electricity? ■END■ (10[5])