When teaching a group of new mental health nurses about the major difference between bipolar I and bipolar II disorders, which would be most appropriate to include?

The mania symptoms of bipolar II disorder have less effect on functioning.

Bipolar II is more often recognized than bipolar I.

Unlike bipolar II, bipolar I disorder involves no symptoms of mania, but only depression.

Both disorders are the same, except the risk for suicide is greater with bipolar I disorder.