A Patient Has a Long Smoking History and Has Recently

A patient has a long smoking history and has recently coughed up blood. The physician suspects that there may be lung cancer, but no lesions can be seen on a standard chest radiograph. A CT scan offers which of the following advantages?
1) Bronchial tumors can be seen.
2) Lung tumors as small as 0.4 cm can be seen.
3) A tumor's metabolism can be identified.
4) A mediastinal mass can be seen.

A) 1, 3
B) 1, 2, 4
C) 2, 3, 4
D) 1, 2, 3