Equation of any plane containing the line ax−x1=by−y1=cz−z1 is A(x−x1)+B(y−y1)+C(z−z1)=0 , then pick correct alternatives
(1) aA=bB=cC is true for the line to be perpendicular to the plane
(2) A(a+3)+B(b−1)+C(c−2)=0
(3) 2aA+3bB+4cC=0
(4) Aa+Bb+Cc=0