An 80-Year-Old Woman Injured Her Foot on a Piece of Rusty

An 80-year-old woman injured her foot on a piece of rusty wire. She tells the nurse she had a tetanus booster when she was 75. The nurse's response will be based on the knowledge that tetanus boosters

A) should be repeated every 5 years.
B) are not necessary for persons older than 70.
C) do little good for the older adult.
D) should be repeated with every injury, regardless of the previous booster.