If `4a^2+9b^2-c^2+12ab= 0` then the family of straight lines `ax + by +c=0` is concurrent at : (A) `(-3,2) or (2,3)` (B) `(-2,3) or (2,-3)` (C) `(3,2) or (-3,-2)` (D) `(2,3) or (-2,-3)`