Careerbuilder.com has made its Monk-e-mail site, which allows users to send personalized, private-themed e-cards for all occasions, so compelling that more than 100 million Monk-e-mails have been sent since 2006. Careerbuilder.com is using ________ to promote its services.

A) viral marketing
B) opt-out marketing
C) customerization
D) niche marketing
E) buzz marketing

Viral Marketing

A marketing strategy that relies on individuals sharing content with others, leading to exponential exposure and influence.

Monk-E-Mail

An innovative and entertaining email service that allows users to send messages with customizable, animated monk characters.

Personalized E-Cards

Digital greeting cards that can be customized with personal messages, images, or videos, often used for special occasions or as marketing tools.