The formula for output offset voltage of an op-amp due to input bias current
(a) VOIB= RF*IB
(b) VOIB= (RF+R1)/IB
(c) VOIB= (1+RF)*IB
(d) VOIB= [1+(RF/R1)]*IB
I had been asked this question by my school teacher while I was bunking the class.
The above asked question is from Input Bias Current in chapter Operational Amplifier Fundamentals of Linear Integrated Circuits