2.98 A particular inverting amplifier with nominal gain of −100 V/V uses an imperfect op amp in conjunction with 100-k and 10-M resistors. The output voltage is found to be +5.3 V when measured with the input open and +5 V with the input grounded. (a) What is the bias current of this amplifier? In what direction does it flow? (b) Estimate the value of the input offset voltage. (c) A 10-Mresistor is connected between the positive-input terminal and ground. With the input left floating (disconnected), the output dc voltage is measured to be −0.6 V. Estimate the input offset current.