Comprehension (Q. 5 & 6) Let `A B` be any chord of the circle `x^2+y^2-2x-6y-6=0` which subtends a right angle at the point (2, 4). Locus of mid point of `A B` is `x^2+y^2-7y-16=0` `x^2+y^2-3x-7y+7=0` `x^2+y^2+3x+7y-16=0` `x^2+y^2+3x+7y-7=0`