Final answer:
Custard orders in the Drive Thru should be made when the Drive Thru Position communicates that it should be made, to ensure freshness and optimal serving conditions.
Step-by-step explanation:
When considering when custard orders placed in the Drive Thru should be made, the best practice would generally be C) When the Drive Thru Position communicates that it should be made. This ensures that the custard is prepared fresh and served at an optimal temperature and consistency, enhancing customer satisfaction. Moreover, making custard on demand when indicated by the Drive Thru Position helps in managing the queue effectively and reducing waste, as custard made too early may melt or become unsuitable for serving if the customer faces a delay in picking it up.