Answer: (c) Balanced
Before applying any external input signal, an operational amplifier must be in a balanced condition. This means:
1. Output offset voltage = 0V
2. No voltage difference between the two input terminals
3. The op-amp is properly biased and ready to accept signals
Balancing (also called nulling) is achieved using the offset null pins available on most op-amps. This ensures that when no input signal is applied, the output voltage is zero, preventing DC drift and offset errors in subsequent amplifications.