Carriers Rush to Deploy Contactless Tech in Airports

When the Covid$-19$ crisis gripped the airline industry in March, it became clear to United Airlines that it needed to react quickly. It used in$-$house staff to develop a software upgrade to allow touchless baggage check at its check$-$in kiosks..

Source: Travel Weekly, June $22,2020$

What is the total fixed cost of operating one contactless check$-$in kiosk?

The total fixed cost of operating one contactless check$-$in kiosk

A$.$ is the cost of the kiosk and the software that runs it

B$.$ is zero because contactless check$-$ins are a temporary pandemic necessity

C$.$ equals the wages of the staff who developed the software

D$.$ depends on the number of passengers who use it