The correct answer is: A. Values of IC and VCE when signal is applied
The operating point of a transistor is the point at which it is biased and is typically specified by the collector current (IC) and collector-emitter voltage (VCE). The operating point is important because it determines the transistor’s characteristics, such as its gain and efficiency.
Option B is incorrect because the magnitude of the signal is not the same as the operating point. The magnitude of the signal is the maximum value of the signal, while the operating point is the point at which the transistor is biased.
Option C is incorrect because the zero signal values of IC and VCE are not the same as the operating point. The zero signal values are the values of IC and VCE when there is no signal applied, while the operating point is the point at which the transistor is biased.
Option D is incorrect because the operating point is a valid answer to the question.