Final answer:
In terminal digit filing, the sequence is arranged by the last digits first, the middle second, and the initial digits last. Therefore, the number 25-10-12 would come immediately after 25-09-11 (option c).
Step-by-step explanation:
In terminal digit filing, which is a method of organizing files by the last set of digits for quick sorting and retrieval, the number 25-10-12 would come immediately after 25-09-11 (c). The sequence is determined by first organizing by the last two digits, then the middle two, and finally the first two. So, the correct order with the options given would be: 25-09-11, 25-10-12, 26-09-12, and then 24-10-12 as the last because it has the smallest first set of digits after considering the terminal digits.