What does the notation represent?
A. The number of ways to choose all but 3 items out of 7, where order doesn't matter.
B. The number of ways to choose 3 items out of 7, where order does matter.
C. The number of ways to choose all but 3 items out of 7, where order does matter.
D. The number of ways to choose 3 items out of 7. where order doesn't matter.