The Computer Department in a large company assigns a personal code number to each employee in the form of a three-digit number using the digit 0 to 9 inclusive. Code numbers starting with 0 are reserved for members of the management. How many code numbers are available for non-management employees? Select one: a. 950 b. 800 c. 900 d. 920

To find the number of available code numbers for non-management employees, we need to consider that their codes can't start with 0. The first digit can be any digit from 1 to 9 (which gives us 9 options), and the other two digits can be any digit from 0 to 9 (which gives us 10 options for each). So, the total number of code combinations for non-management employees is: 9 (choices for the first digit) x 10 (choices for the second digit) x 10 (choices for the third digit) = 900. Therefore, the answer is c. 900.