भावनाओं, दृष्टिकोणों और विश्वासों को जानबूझकर बदलने या प्रभावित करने के लिए डिज़ाइन किए गए संचार को क्या कहा जाता है?

According to Everett Rogers, which of the following is NOT one of the four main elements in the diffusion of innovations?

The physical pathway or medium through which a message travels between the sender and the receiver is called a ________.