Which of the following represents an example of aggressive approach to demand management in the service sector when demand and capacity are not particularly well matched $("$out$-$of$-$sync$"$ with each other$)?$

A$.$

inexpensive rates for weekend phone calls

B$.$

keeping dental appointments

C$.$

providing airline reservations

D$.$

using first$-$come, first$-$served policy

E$.$

none of the above