Answer:
10000 options
Step-by-step explanation:
There are 10 options of digit from 0 to 9. It means there are 10 options for the first slot, 10 for the 2nd slot, 10 for the 3rd slot, and 10 for the last slot of each of the 4 slots of the password. For all 4 passwords the total amount of choices would be
[tex] 10 * 10 * 10 * 10 = 10^4 = 10000 options ranging from 0000 to 9999[/tex]
