At Henderson Elementary School, grades are not assigned to kindergarten or first-grade students; instead, teachers check satisfactory or unsatisfactory. As a result, the teachers don't use formal assessments, instead relying on their informal observations of the students' behavior. Based on this information, which of the following is the most accurate statement?
a. Their assessments are likely to be valid but not reliable.
b. Their assessments are likely to be reliable but not valid.
c. Their assessments are likely to be both valid and reliable.
d. Their assessments are likely to be both invalid and unreliable.
d
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