In a constant V/f control of induction motor, the ratio V/f is maintained constant from 0 to base frequency, where V is the voltage applied to the motor at fundamental frequency f. Which of the following statements relating to low frequency operation of the motor is TRUE?

• A. At low frequency, the stator flux increases from its rated value.
• B. At low frequency, the stator flux decreases from its rated value.
• C. At low frequency, the motor saturates.
• D. At low frequency, the stator flux remains unchanged at its rated value.