Die Rank

Let $X_1, \ldots, X_5$ be the upfaces of $5$ independent rolls of a fair 6-sided die with values $1$ to $6$ (so $X_1$ is the first roll, $X_2$ the second, and so on). Rank the following from largest to smallest in terms of value: a) $E[X_1 \cdot X_2]$; b) $E[X_2^2]$; c) $E[X_{(3)}^2]$, where $X_{(3)}$ is the median of the $5$ die rolls. Let $a = 1$, $b = 2$, and $c = 3$. Answer with the integer corresponding to the concatenation of the order from largest to smallest. For example, if you believe $c > b > a$, answer with $321$.