What type of communication is used to build relationships with the help of computers and the internet?

Online communication is the correct answer because it specifically refers to interactions that occur through digital platforms facilitated by computers and the internet. This mode of communication includes various forms such as emails, social media interactions, video conferencing, and online forums, which are crucial for creating and maintaining relationships in the digital age.

The nature of online communication allows individuals and organizations to reach out, engage, and collaborate in real-time, transcending geographical barriers. It is particularly effective in agricultural extension as it enables timely dissemination of information, fostering dialogue and interaction among farmers, extension agents, and stakeholders.

Other forms of communication like group, public, and mass communication do exist, but they do not inherently rely on computers and the internet for their functionality. Group communication typically involves a limited number of individuals interacting directly, while public communication often refers to delivering messages to larger audiences without the engagement and interactivity offered by online platforms. Mass communication deals with one-way dissemination of information to broad audiences through traditional media like television and newspapers, lacking the interactive capabilities that online communication provides.