Wes and Steve understand it$$s important to graph their historical sales data when developing a forecast because doing so will:

$1.$Ensure that their forecast is accurate

$2.$Enable them to identify irregular variations within the data

$3.$Allow them to see if seasonal variations occur within their data

$4.$Enable them to select a proper forecasting technique

Group of answer choices

a$)1,3$ and $4$

b$)1$ only

c$)2,3$ and $4$

d$)$ All of the above