Depression in the elderly is:

A. Postpartum depression occurs after childbirth and is usually treated with a combination of psychotherapy, antidepressant medication, and support. While light therapy might have some benefits for mood disorders, it is not the primary treatment for postpartum depression.
B. Seasonal affective disorder is a type of depression that typically occurs at certain times of the year, usually in the winter months when there is less natural sunlight. Phototherapy, or light therapy, is considered an effective treatment for SAD as it helps to mimic natural sunlight and improve mood by influencing circadian rhythms and serotonin levels.
C. While light therapy can have effects on mood, it is generally not used as a primary treatment for bipolar disorder. Bipolar disorder is often managed with mood stabilizers and other medications to prevent mood swings.
D. While light therapy can be beneficial for some types of depression, it is not typically the first-line treatment for moderate depression. Moderate depression is usually treated with antidepressants, psychotherapy, or a combination of both.

A. Assault is the threat of bodily harm. While using restraints might cause fear, it doesn't involve a threat of immediate harm.
B. This involves the unjustified restriction of a person's freedom of movement. Using restraints to prevent wandering when less restrictive measures haven't been exhausted might constitute false imprisonment.
C. Negligence is the failure to provide reasonable care. While using restraints inappropriately could be considered negligence, it's not the primary legal issue in this case.
D. Defamation involves damaging someone's reputation. This is not relevant to the situation.