If `alpha,beta` are the roots of `a x^2+b x+c=0a n dalpha+h ,beta+h` are the roots of `p x^2+q x+r=0t h e nh=` `-1/2(a/b-p/q)` b. `(b/a-q/p)` c. `1/2(b/q-q/p)` d. none of these