关于以下C++代码，（ ）⾏代码会引起编译错误。
#include <iostream>
using namespace std;
class Base {
private: int a;
protected: int b;
public: int c;
Base(): a(1),b(2),c(3) {}
};
class Derived: public Base {
public: void show() {
cout << a << endl; // Line 1
cout << b << endl; // Line 2
cout << c << endl; // Line 3
}
};
