Final answer:
The sequence 01-00-12, 80-99-00, 81-98-00 is not in correct order according to terminal digit filing system rules because while the first set of numbers is in ascending order, the second set is not, with 99 incorrectly placed before 98.
Step-by-step explanation:
The question is asking whether a given sequence of numbers is ordered correctly in a terminal digit filing system. In such a system, numbers are typically organized based on the last digit or digits, and then further sorted by the preceding digits. Given the sequence provided - 01-00-12, 80-99-00, 81-98-00, if we assume that the terminal digits are the first set (after the dash), then 01, 80, 81 are in correct ascending order. If we then look at the middle set of digits, as the terminal digit filing sometimes involves more than two levels of sorting, then 00, 99, 98 are not in the correct order, as 99 should not come before 98. Therefore, the sequence is not correctly ordered as per terminal digit filing rules.