Let $X$ be the smallest positive integer, consisting of only the digit $4$ and $9$ (at least one of each), that is divisible by both $4$ and $9$. What is the last four digits of $X$? 
选项为:A:$$4444$$  B:$$4494$$  C:$$4944$$  D:$$9444$$  E:$$9944$$  请回答其中一个选项.