Skyline Agency is compensated through a markup charge. What does that mean?

Question$\mathrm{}\mathrm{}$

a)$)$

Skyline charges the client an hourly rate for the services provided by its employees.

b)$)$

Skyline contracts out its services and then charges the client an agreed−$-$upon percentage above what those contracted services cost.

c)$)$

Skyline is paid a variable amount based upon the achievement of certain objectives, as measured through sales.

d)$)$

Skyline receives an agreed−$-$upon percentage of the amount that the client spends on media.