A software company is developing a new accounting program specifically designed for small businesses. They know that different businesses have unique accounting needs. The company decides to create a series of email marketing campaigns with targeted content for different industries $($e$.$g$.,$ retail, healthcare, professional services$)$ to see how they respond to the messages. What is the primary benefit of using this direct marketing approach?

Reduced promotional costs

Increased brand awareness

Ability to reach a large audience quickly

Measurable results