Permissible sets of quantum numbers?

Question

Which of the following are permissible sets of quantum numbers for an electron in a hydrogen atom?

(a) n = 2, l = 1, ml = 1

(b) n = 1, l = 0, ml = -1

(c) n = 4, l = 2, ml = -2

(d) n = 3, l = 3, ml = 0

Answer 1

n >= 1

0 <= l < n

-l <= ml <= l

Figure out which ones work with the inequalities.  

Answer 2

b i've done this b4