The following C++ code consists of an error. What is the cause of the error? class Human{ public: virtual void speak () { cout << "I am a human." << endl; class Teacher{ public: void speak () { cout << "I am a teach. I teach students." << endl; } ; int main (0 { Human *h; Teacher t; h = &t; h -> speak (); return 0; This is not valid to use the same function/method name in two classes. Should not use the keyword virtual in the speak() in class Human. The upcasting by creating a superclass pointer reference to the subclass is prohibited. The class Teacher is not derived from the class Human.

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