Match the type of immunity listed in column I with the examples listed in column II. Choose the answer that gives the correct combination of alphabets of the two columns
A. A = p, B = q, C = r, D = t
B. A = s, B = r, C = t, D = q
C. A = s, B = t, C = q, D = r
D. A = t, B = s, C = r, D = p
