Let `f: RrarrRa n dg: RrarrR` be two one-one and onto function such that they are the mirror images of each other about the line `y=a`. If `h(x)=f(x)+g(x),t h e nh(x)` is (a)one-one and onto (b)only one-one and not onto (c)only onto but not one-one (d)neither one-one nor onto