If you want to analyze the hidden relationships or patterns of data stored in the large database or data warehouse $($e$.$g$.,$ what percentage of the profits do our top $10\%$ customers generates?$),$ you would use $\_\_\_\_\_\_\_\_\_\_\_.$

$1.$

Data mining

$2.$

OLAP $($on$-$line analytical processing$)$

$3.$

System SW

$4.$

Operating system