What Will Happen If the Input Analog Voltage (V_a) is

What will happen if the input analog voltage (V_a) is greater than a digital- ramp ADC's full- scale (V_ax) value?

A) The counter will count up to its maximum value causing V_ax to reach its full- scale output. All operations will then cease until V_ax decreases below V_ax.
B) The comparator will detect that V_a is larger than the V_ax full- scale output and all operations will cease until V_a decreases below V_ax full- scale.
C) The counter will repetitively count up from zero to maximum producing a continuously repetitive staircase waveform at V_ax.
D) The comparator will detect that V_a is beyond the range of V_ax and will keep the ADC's output at zero until V_a is decreased below V_ax full- scale.