An ideal operational amplifier is to be connected as a differential amplifier as shown in the diagram below. Nominally, $$R_1=R_3=5kOmega$$ and $$R_2=R_4=200kOmega$$
The gain for an input $$V_2$$, with the input $$V_1$$, grounded is most nearly:
A. 20
B. 35
C. 40
D. 41