An organization uses specific equipment to monitor the pH level of its wastewater discharge. According to ISO 14001:2015 Clause 9.1.1, what must the organization ensure regarding this equipment?
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A
It is the most technologically advanced model available on the market.
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B
It is replaced with new equipment every two years regardless of its condition.
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C
It is used, maintained, and calibrated or verified as applicable, to ensure valid results.
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D
It is audited by an external, third-party laboratory at least once per year.