In statistical process control, if you have a control chart for individual measurements $(x-$chart$)$ and you want to calculate the Lower Control Limit $($LCL$)$ for a subgroup size of $5,$ what factor would you use for multiplying the standard deviation $()$ to find the LCL$?$

$1\mathrm{.}128$

$1\mathrm{.}880$

$2\mathrm{.}059$

$2\mathrm{.}660$