The human immune system is made up of special cells, proteins, tissues, and organs that defend against viruses and microorganisms every day. In the human body, there are two different response systems (as described in the table). Which choice correctly identifies X and Y?

X= Active, Y= Passive
X= Antibodies, Y= White Blood Cells
X= Inborn, Y= Acquired
X= Acquired, Y= Inborn