The following functions have {a, b, c, d, e} as both their domain and codomain. For each, determine whether it is (only) injective, (only) surjective, bijective, or neither injective nor surjective.
a) f(x)=x+1
b) g(x)=x^2
c) h(x)=sin(x)
d) k(x)=∣x∣