Following a fall from a horse during rodeo

问题：

Following a fall from a horse during rodeo practice, an 18-year-old client is seen in the emergency department. He has a large, dirty laceration on his leg. The wound is vigorously cleaned, closed, and dressed. In the past, the client has received the full immunization regimen for tetanus toxoid. The nurse asks the client about his tetanus immunization history and he says, "I had my last shot when I was 11 years old. " The nurse should（）

A. advise the client to get a tetanus vaccine within 3 years.
B. request the physician to order a serum tetanus titer.
C. plan on administering a dose of tetanus vaccine.
D. teach the client that he has life-long immunity to tetanus.