What is wrong with the following statement about sensitivity ?( )
A.
The bigger wheel is used for a coarse adjustment to calibrated values. The smaller wheel is used for fine-adjust to calibrated values.
B.
The "Volts/Div."wheels amplify an input signal so that for a division a given voltage level is in valid.
C.
The "Time/Div."wheel determines, how long the electronic beam which draws the curve needs for moving from the left to the right edge of a division.
D.
The sensitivity of y axis controls the "time scale".