Question: What is the definition of a fast cycler ?: 
 Options:  <1> The presence of at least four episodes of mood (depressive, manic, or hypomanic) in a period of 12 months. <2> The presence of at least 6 episodes of mood in a period of 6 months. <3> The change from one mood episode to another in a period less than 48 hours. <4> The presence of more than two episodes of mania or hypomania detectable in a month. <5> Patients with Bipolar Disorder I or II with extreme hyperreactivity to minimal stressors.
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