Which of the following is a self-referential object?

a. class SelfRefer
{
int * xPtr;
};
b. class selfRefer
{
selfRefer x;
};
c. class SelfRefer
{
SelfRefer * xPtr;
};
d. class SelfRefer1
{
SelfRefer2 x;
};
class SelfRefer2
{
SelfRefer1 x;
};

c. class SelfRefer
{
SelfRefer * xPtr;
};