A caterer accepts a large order for a school function. On the morning of the event, stations are set up to make the $500$ sandwiches ordered for that day. Station one has two individuals cutting sandwich buns, station two has four individuals placing the meats and cheeses on the rolls, station three adds condiments and wraps the sandwich. The individual who devised the sandwich$-$making production plan is operating under a

a$.$ job specialization approach.

b$.$ job enrichment approach.

c$.$ job enlargement approach.

d$.$ job rotation approach.