In the previous question, assuming that each step has its own staff member, what is the maximum number of hot sandwiches that can be made in $4$ hours? $[$Chapter $4]$

Step $1(1$ min$/$unit$)>>$ Step $2(4$ min$/$unit$)>>$ Step $3(3$ min$/$unit$)$

$30$

$60$

$240$

None of the above