What is the primary difference between push and pull manufacturing systems?

$($a$)$ Push systems focus on finished goods inventory, while pull systems focus on raw materials inventory.

$($b$)$ Push systems prioritize production based on forecasts, while pull systems prioritize customer orders.

$($c$)$ Push systems are more suitable for mass production, while pull systems are more suitable for custom production.

$($d$)$ Push systems utilize kanban cards, while pull systems utilize Gantt charts.