$($a$)$ Information systems $($IS$)$ are a subset of information technology $($IT$)$ and function to facilitate enterprises in business decision$-$making. Identify THREE $(3)$ operational functions performed by information systems $($IS$)$ within enterprises to aid in business decision$-$making.$($a$)$ Information systems $($IS$)$ are a subset of information technology $($IT$)$ and function to facilitate enterprises in business decision$-$making. Identify THREE $(3)$ operational functions performed by information systems $($IS$)$ within enterprises to aid in business decision$-$making.