The correct answer is: B. Middle
The operating point of a transistor circuit is the point at which the transistor is biased. The bias point is determined by the DC load line, which is a line on the transistor’s input-output characteristic curve that represents the DC conditions of the circuit. The operating point should be located in the middle of the load line so that the transistor is operating in its linear region. This will allow the transistor to amplify signals without distorting them.
The end points of the load line represent the maximum and minimum values of the transistor’s collector current. The maximum current point is the point at which the transistor is saturated, and the minimum current point is the point at which the transistor is cut off. Neither of these points are desirable operating points, as they will result in distortion of the amplified signal.
The middle of the load line is the point at which the transistor is operating in its linear region. This is the desired operating point, as it will allow the transistor to amplify signals without distorting them.