A couple expresses concern about the expense involved in immunizing their child. The parents state, ...

A couple expresses concern about the expense involved in immunizing their child. The parents state, I don't understand why this is necessary. None of these diseases are around any more. The nurse's best response would be:
 
  a. These diseases continue to occur in children today and would be very costly in both money and health terms
  b. Immunizations are not needed until the child is ready to attend school
  c. Children only need to be immunized if they will be taken into high-risk areas
  d. Parents can wait to vaccinate their child until the child begins to display symptoms of the disease