A semi-palindrome is a four-digit number whose first two digits and last two digits are identical. For instance, 2323 and 5757 are semi-palindromes, but 1001 and 2324 are not. What is the difference between the largest semi-palindrome and smallest semi-palindrome?<spanclass=′latex−bold′>(A)</span>7979<spanclass=′latex−bold′>(B)</span>8080<spanclass=′latex−bold′>(C)</span>8181<spanclass=′latex−bold′>(D)</span>8484<spanclass=′latex−bold′>(E)</span>8989