The distance of the point `(1,3,-7)` from the plane passing through the point `(1,-1,-1),` having normal perpendicular to both the lines `(x-1)/1=(y+2)/(-2)=(z-4)/3a n d(x-2)/2=(y+1)/(-1)=(z+7)/(-1)i s:` `5/(sqrt(83))` (2) `(10)/(sqrt(74))` (3) `(20)/(sqrt(74))` (4) `(10)/(sqrt(83))`