Column I lists the components of body defence and Column II lists the corresponding descriptions. Match the two columns. Choose the correct option from those given:
Column IColumn II(a)Active natural(p)Injection of gamma immunity globulins(b)First line of defence(q)Complement proteins and interferons(c)Passive natural(r)Direct contact with the immunity pathogens that have entered inside(d)Second line of defence(s)Surface barriers(t)Antibodies transferred through the placenta