Final answer:
Momentum Automobiles is a client that outsources its advertising needs to Dreams Inc., an advertising agency, and does not partake in decision-making for advertising strategies.
Step-by-step explanation:
In the given scenario, Momentum Automobiles would be classified as a client. As a client, Momentum hires Dreams Inc., an advertising agency, to manage its advertising needs. Momentum Automobiles provides the necessary finances but does not involve itself in the decision-making process related to advertising strategies or creative outputs. This is typical in business relationships where firms outsource certain functions like advertising to specialists.