10. After modifying the contents of a . cpp file a. all the source files of the entire application must be recompiled b. those source files that include the . cpp file must be recompiled c. only the corresponding .cpp file must be recompiled d. no recompilation is necessary, only linking need be performed A method like tostring can be available to all objects in Java but not C++ because a. Java is more dynamic than C++ b. Java's polymorphism is more powerful than C++'s c. Java has an object hierarchy tree and C++ doesn't d. Java runs on a virtual machine