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Let two circles S_1=0 and S_2=0 intersect at point A and B . L_1=0 is the line joining A and B where S_1=x^2+y^2+2ax+2by-5=0 and S_2=x^2+y^2+2x+4y-4=0 Let AB subtend and angle theta at (0,0) and angle subtended by S_1=0 and S_2=0at P(3,4) is alpha and beta respectively. If equation of L_1=3x+4y=7, then the value of 4a-b is equal to

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ANSWER :B


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