In a bustling caf$,$ a host greets and seats customers; a barista prepares coffee and other beverages; a chef handles food orders, preparing meals for customers; and a cashier finalizes the transactions, collecting payment and ensuring customers have everything they need before they leave. The utilization rates of the host, barista, chef, and cashier are $0\mathrm{.}7,0\mathrm{.}8,0\mathrm{.}9,$ and $0\mathrm{.}6,$ respectively. Identify the bottleneck in this caf$\text{'}$s service process.

Group of answer choices

Barista

Host

Cashier

Chef