How many different positive integers exist between 10^3 and 10^4, the sum of whose digits is equal to 2?  Pick one.
A) 3
B) 4
C) 5
D) 6
E) 7
1001   1010   1100   2000   TOTAL NO. 4   4
<result>B</result>
How many different positive integers exist between 10^3 and 10^4, the sum of whose digits is equal to 2?