Refer to the Scenario Below to Answer the Following Question(s)

Refer to the scenario below to answer the following question(s) .
The Treble Clef sells music books, musical instruments, and novelty gifts of a musical nature. In recent years, owner Gary Zahn has served as the local representative of several musical instrument manufacturers, providing a contact person for three local schools. He sends a sample of a manufacturer's products to schools that request a demonstration or presentation. "If we don't have it, we can definitely get it for you," Gary tells all Treble Clef visitors and customers.
Most walk-ins are particularly interested in a specific piece of sheet music from a particular era or just browsing among the hundreds of music knick-knacks in the store. Gary spends most of his time making presentations to beginners at the local schools and making biweekly visits to the schools to deliver instruments, make minor repairs, or pick up instruments to ship to the manufacturer for more complicated repairs.
After establishing a loyal customer base, Gary was convinced that a Treble Clef Web site could benefit a variety of customers. He began with a simple Web site that provided information about the store and the types of gifts and services available. The site received so much response that Gary added a question-and-answer option. Questions poured in, ranging from "Where can I get sheet music for 'Hello, Dolly'?" to "Do you carry clarinet reeds?" to "My saxophone needs two new pads. When will you be at Elmhurst School to repair it?" The Web site is now able to accept credit card orders, and gifts can even be wrapped and shipped for no extra charge.
"This Web site idea was fantastic!" Gary admitted. "It allows us to be so responsive. And our novelties sales have doubled!"
-In addition to sending samples of sheet music to schools, Gary sends school music directors messages with links to sample digital clips of the compositions. What kind of marketing is this?

A) e-mail marketing
B) viral marketing
C) kiosk marketing
D) mobile marketing
E) catalog marketing