Given below classes which of the following are the possible row entries in vtable of D1 class?

[answerhappygod]

class Base
{
public:
virtual void function1() {};
virtual void function2() {};
};
class D1: public Base
{
public:
virtual void function1() {};
};
class D2: public Base
{
public:
virtual void function2() {};
};
a) Base::function1() and Base::function2()
b) D1::function1() and Base::function2()
c) Base::function1() and D1::function2()
d) D1::function1() and D1::function2()