Have been stuck on this for a while now:

Which of the following statements are TRUE? Check all that apply In C++ and C# methods need a virtual keyword to allow dynamic binding. Otherwise, they are statically bound. In Ruby, a program can add members to class any number of times, simply by providing secondary definitions of the class that include the new members, so during execution the current definition of a class is the union of all the class definitions that have been executed Ruby is the pure object-oriented language in that virtually everything in the language is an object and all computation is accomplished through message passing Java directly supports only single inheritance but interfaces can be used to simulate multiple inheritance even if these interfaces define a public method with the same name and protocol Java, C++, and C\# are similar in a sense that all classes must be ultimately derived from a single root class, called Object