An inferosuperior axial shoulder projection that shows accurate positioning and was obtained with the humeral epicondyles positioned at a 45-degree angle with the floor demonstrates

1. the posterolateral aspect of the humeral head.
2. almost superimposed inferior and superior glenoid fossa margins.
3. the lesser tubercle in partial profile anteriorly.
4. the lateral edge of the coracoid base medial to the inferior glenoid cavity.
a. 1 and 2 only
b. 3 and 4 only
c. 1, 2, and 3 only
d. 1, 2, 3, and 4

C