Match the pairs:

Column $I$ (Type of Immunity)	Column $II$ (Example)
$i$. Natural acquired active	$a$. $BCG$ Vaccine
$ii$. Artificial acquired active	$b$. Immunity against measles
$iii$. Natural acquired passive	$c$. Colostrum
$iv$. Artificial acquired passive	$d$. Injections against rabies

Select the correct option from the following:

• A
  $i-b, ii-a, iii-d, iv-c$
• B
  $i-c, ii-a, iii-b, iv-d$
• C
  $i-b, ii-a, iii-c, iv-d$
• D
  $i-c, ii-a, iii-d, iv-b$