Final answer:
An ideal op-amp is characterized by infinite open-loop gain, infinite input impedance, and zero output impedance. The 'Finite bandwidth' option (4) is not a property of an ideal op-amp, as it implies a decrease in gain at higher frequencies, which is not consistent with the ideal assumptions.
Step-by-step explanation:
The property that is not a characteristic of an ideal operational amplifier (op-amp) is Finite bandwidth. Ideal op-amps are typically characterized by several assumptions for simplicity in analysis.
They are assumed to have infinite open-loop gain, infinite input impedance to prevent any current from flowing into the input terminals, and zero output impedance to allow the op-amp to provide maximum power to the load without any internal loss.
However, a finite bandwidth means that the gain of the op-amp decreases at higher frequencies, which contrasts with the ideal model that assumes the gain to be infinite across all frequencies.