Airlines frequently overbook their flights in order to maximize the yield $($revenue$)$ of each flight because they expect to have no$-$shows or flight cancellations. When all passengers show up$,$ the flight is overbooked and the airlines will ask for volunteers to get on another flight in exchange for vouchers. This overbooking strategy is aimed at overcoming which of the following characteristics of services?

Intangible

Heterogeneous

Simultaneous

Inseparable

Perishable