Refer to the circuit in Figure. 1. where the op amp is assumed to be ideal. Given that Ra=...

Refer to the circuit in Figure. 1. where the op amp is assumed to be ideal. Given that Ra= 4 kΩ,  Rb=5 kΩ,  Rc = 20 kΩ, υa= 200 mV. υb = 150 mV, υc = 400 mV. and υCC = ±6 V. specify the range of Rf for which the op amp operates within its linear region.

Figure. 1