$[1]$ Explain the structure and operational steps of the attribute$-$based access control

$($ABAC$)$ model. Additionally, compare and contrast the ABAC model with the

Discretionary Access Control $($DAC$)$ and Role$-$Based Access Control $($RBAC$)$

models, highlighting the distinct features and advantages of ABAC over the others.

$[$CLO $2\mathrm{.}1]$