Dr. Petra has created a new scale to measure the number of depressive symptoms her patient experiences. She had to patient take the same depression scale four times, and all four times the patient's score was a 51, which indicates a high level of depressive symptoms on Dr. Petra's scale. In addition, the patient's score on the Beck Depression Inventory, a well-established depression test, was a 25, which indicates moderate depressive symptoms. Dr. Petra's depression scale is:
a. valid but not reliable
b. reliable but not valid
c. both reliable and valid
d. neither valid nor reliable
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