Here are the steps to form a CBC$.$ Identify the correct sequence:

$1)$ Observation of crew composition and tasks

$2)$ Graphical depiction of the collected data

$3)$ Record time spent on each task for activity cycles

$4)$ Identification of cyclical activity

$1-2-3-4$

$4-3-2-1$

$4-1-3-2$

$2-3-4-1$