Say there's an abstract class named Solid. A Sphere class extends Solid. Which line(s) of code will cause an error? Solid s1, s2, s3; s1 = new Solid(); s2 = new Sphere(); s3 = null; I am so confused with the "actual type" and "reference type" in an object instantiation. In the line "s1 = new Sphere();", which class type is the "actual type" and which is the "reference type"?

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