​An accurate psychometric testing instrument

A) ​must be both valid and reliable.
B) ​may be valid but not reliable.
C) ​may be reliable but not valid.
D) ​must be given with time limits.

A psychometric testing instrument must be both valid (measuring what it is intended to measure) and reliable (consistent results over time). A test could be reliable but not valid if it consistently produces similar results that do not accurately measure the intended construct. Time limits are not a necessary component of psychometric testing, and may not be appropriate for certain populations (e.g. individuals with disabilities or cognitive impairments).