The determinant \(\left|\begin{array}{lll}\rm b^2−ab & \rm b−c & \rm b c−a c \\ \rm a b−a^2 & \rm a−b & \rm b^2−a b \\ \rm bc−a c & \rm c−a & \rm ab−a^2\end{array}\right|\) equals
1
abc (b–c) (c – a) (a – b)
2
(b–c) (c – a) (a – b)
3
(a + b + c) (b – c) (c – a) (a – b)
4
None of these