Which of the following statements correctly describes the relationship between panic attacks and ...

Which of the following statements correctly describes the relationship between panic attacks and panic disorder?
 
  a. Having one panic attack meets the criteria for diagnosing panic disorder.
 b. Both panic attacks and panic disorder are quite common, affecting about one quarter of the population.
 c. Both panic attacks and panic disorder are quite rare, affecting about 23 percent of the population.
 d. Panic attacks are common, but one must have repeated attacks and fear of attacks in order to be diagnosed with panic disorder.