How is serious mental liness (SMI) best characterized?

A. Major ongoing mental illness marked by significant functional impairments: Disorders such as schizophrenia, bipolar disorder, and severe major depression fall into this category because they persist over time and significantly disrupt daily functioning, employment, and relationships. B. Mental illness with longer than 2 weeks duration: Duration alone does not define SMI. Many conditions, including mild depression or adjustment disorder, may last longer than two weeks but do not cause the profound disability associated with SMI. C. Major mental illness that cannot be treated to prevent deterioration of cognitive and social abilities: SMIs can often be managed with medications, therapy, and community support, even though complete recovery may not always be possible. The key feature is impairment. D. Mental illness accompanied by physical impairment and severe social problems: While clients with SMI may also have medical or social challenges, these are not required criteria. The definition centers on persistent psychiatric illness with marked functional impairment.