To find the input bias current, you'd need to use the relationship between the input bias current and the components in the circuit. The input bias current (IBI_BIB) typically depends on the configuration of the op-amp circuit, the resistances involved, and the op-amp's characteristics.
However, without the actual circuit diagram, it's impossible to calculate the exact value of the input bias current. Generally, the input bias current is specified in the datasheet of the op-amp (for example, the 741 op-amp has an input bias current in the range of 100nA to 500nA), and it can be calculated or estimated based on the resistive network around the op-amp.
If you have more details or the actual circuit, I can help you calculate it.
Given the options, if we assume typical values for input bias currents (usually in the nanoampere to microampere range), and there's no additional information to suggest otherwise, it seems likely that the answer would be (d) None of the mentioned. However, for an accurate answer, the specific circuit diagram is necessary.