At Ant's Coffee Shop the average wait time to order was five minutes. The one and only cashier then takes the order for a drink and a pastry and collects the order payment. The average order and payment time was one minute per customer. Three baristas, in addition to the cashier, worked behind the counter brewing and delivering coffee drinks and preparing the pastries. While a barista made the drink, another barista could heat the pastry in a small oven and deliver it to the customer. It takes three minutes on average to fulfil a drink order. The pastry heating activity took approximately 90 seconds in the oven, with an additional 1-minute activity where the barista to unload and deliver the food to the counter. Call this entire order fulfilment process at Ant's the "Morning Stop" process.

Assuming the resources are the two types of human resources and the oven, which holds up to three pastries at a time, what is the bottleneck in the Morning Stop process?

Group of answer choices:

Customer

Cashier

Baristas

Preparing the food

Preparing the drinks

None of the other answers are correct.