Let f:[0, 1]->[0,1 be continuous and s(0)=0,s(1)=1. then, f is necessarily (a.) injective, but not surjective. (6.) surjective, but not injective. (c.) bijectiv

Let f:[0, 1]->[0,1 be continuous and S(0)=0,S(1)=1. Then, f is necessarily (a.) injective, but not surjective. (6.) surjective, but not injective. (c.) bijective. (d.) surjective.