Given an LRU web cache of size $4$ with contents A$,$ B$,$ C$,$ D;with A denoting the most recently requested website. Consider the following request process over time $\{$C$,$E$,$F$,$A$,$C$,$A$\}$with A being the last request of this process. What is the last state of the LRU cache?$($Give your answer in the form: X$,$X$,$X$,$X$)$