The answer is discretion in which discretion is the freedom to exercise judgment. In addition, the four contingencies of power substitutability, centrality, visibility, and discretion. The sustainability is a contingency of power relating to the obtainability of substitutes in which power upsurges when there are fewer options and rulings once there are more. The centrality is a possibility of power relating to the unit and environment of interdependence among the power owner and others. The visibility is a contingency of power that upsurges.