Given the continuous function
$y=f\left(x\right)=\{\begin{array}{c}{x}^2+10x+8x\le -2\\ a{x}^2+bx+c-2<x<0\\ x^2+2xx\ge 0\end{array}a\ne 0$ 
Line L touches the graph of  $y=f\left(x\right)$ at 3 points.
There are some expression given in the List–I whose values are given in List–II below: 

	List–I		List–II
(I)	Slope of line L is	(P)	2
(II)	The value of a + b + c is	(Q)	3
(III)	The value of $a^2+b-c$	(R)	4
(IV)	The value of $a\times b-c$ is	(S)	5
		(T)	6
		(U)	7

Which of the following is only incorrect combination.