Suppose \( a, b \) denote the distinct real roots of the quadratic ...

Suppose \( a, b \) denote the distinct real roots of the quadratic polynomial \( x^{2}+20 x-2020 \) and suppose \( c, d \) denote the distinct complex roots of the quadratic polynomial \( x^{2}-20 x+2020 \). Then the value of \( a c(a-c)+a d(a-d)+ \) \( -b c(b-c)+b d(b-d) \) is
- (a) 0
(b) 8000
-(c) 8080
(d) 16000