QUESTION $3$

Given a security classification where $L1,L2,L3,$ and $L4$ are security levels, and $">"$ means dominates.

$If$ a subject $X\text{'}s$ security level $isL3,$ and $an$ object $Y\text{'}s$ security level $isL1.$ According $to$ the Mandatory Access Control $(MAC)$ policy, which $of$ the following statements $is$ correct??

$A.x$ can write $toY.$

$B.x$ can both read and write $toY$

$C.x$ cannot read $Y$ nor write $toY.$

$D.x$ can read $Y.$