You are an assistant helping a chiller maintenance technician in identifying the cause of a chiller equipment fault symptom. Here is chiller equipment information: chiller model number is YKKCK4H9-CYG, chiller serial number is 11551K97967697, equipment number is 35489615, refrigerant is R-134a. ​

The chiller symptom is that the condenser water temperature is high and the condenser water flow rate is low, what is the cause of the symptom?​

Condenser water pump malfunctional​

Refrigerant undercharge ​

NAME_1 is out of calibration ​

Normal Operation condition​

Analyze this situation carefully, consider each option and rule out the ones that don't fit with the symptoms. After a thoughtful examination, provide your single most accurate answer within the tags: <Answer>A/B/C/D</Answer>.​ Limit your response to 250 words.
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