Which set of quantum numbers corresponds to the following spin-orbital? The quantum numbers are given in the order n, l, m_l, m_s.

a. 3, 0, 0, 1/2

b. 2, 0, 0, 1/2

c. 3, 0, 0, -1/2

d. 3, 1, 0, 1/2

e. 2, 1, 1, -1/2