The clock-drawing test (CDT) has become a standard cognitive screening tool around the world. Like all cognitive screening tests, it is designed to detect early brain changes to determine if a person may be experiencing dementia. Which of the following statements most accurately depicts the usefulness of this test?

The CDT is affected by level of education and can be used alone for diagnostic purposes or for assessing the severity of cognitive impairment.

The CDT serves as an IQ test as well as a test of cognitive functioning.

The CDT is easy to administer in a short time, and it assesses multiple domains of cognitive functioning.

The CDT is an accurate predictor of focal brain degeneration.