See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it ?

1. A. 1-(i 1+i 2)R+i 1r 1=0
2. B. 1-(i 1+i 2)R-i 1r 1=0
3. C. 2-i 1r 2- 1-i 1r 1=0
4. D. - 2-(i 1+i 2)R+i 2r 2=0

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