Drone Drop is a new company specializing in drone delivery service. The company needs to hire a sales force, and are using economic criteria to determine if they should use utilize independent agents (outsource the sales force) or hire a company sales force (internal). Which of the following is true?

Group of answer choices

The costs of using independent agents tend to level off as sales volumes increase

The variable costs of using independent agents are equal to the variable costs expended on an internal sales force

The fixed costs of using independent agents are lower than those of using a company sales force

In terms of cost efficiency, an internal sales force is always more expensive than independent agents

The variable costs of using independent agents do not change over time