The diagram shows the electric field around two charged objects. Two circles representing oppositely charged spheres are labeled Y and Z. There are lines perpendicular to each circle in all directions and bent towards the other circle. What is the best conclusion about the charges that can be made based on the diagram? Y is negative, and Z is positive. Y is negative, and Z is negative. Y and Z are like charges, but their identities cannot be determined. Y and Z are opposite charges, but their identities cannot be determined.