Which of the following is an example of a direct observation method of counting a population?

Explanation is in the file

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Double depression

Explanation:

Double depression is a psychiatric illness that has it's symptoms as low energy and low self-esteem. It is a double or more pivot of the normal depression and has been discovered to be more severe than major and persistent depression disorder. Victims of it suffer for about one to two years and when going through it they want to be alone. They are also known as Dysthymic disorder.