@Magma
I am getting $d)$ one to one and onto
$b)$ one to one but not onto (it is not onto because if it is function of $A\rightarrow B$ , in B elements are $\left ( -\alpha ...,-2,-1,0,1.....,5,6 ,7\right )$ So, there after 7 we are not getting positive values, i.e why not onto
yes $c)$ also not onto because in B it not contains any integer
right?