Indicate which of the following is correct with regard to size and shape of an orbital and its corresponding quantum numbers, n and l:
I. n=2 and l=1 represents the 2p orbital
II. n=3 and l=0 represents the 3s orbital
III. n=4 and l=3 represents the 4d orbital
III only
I and III only
I only
II only
I and II only