Match List I (Types of communication) with List II (Function served):

The right pairing links mass communication with mechanical message transmission, intrapersonal communication with communicating with oneself, group communication with classroom teaching, and interpersonal communication with corridor discussion.

Mass communication in item i goes with mechanical message transmission, reaching a large dispersed audience through media machinery.

Intrapersonal communication in item ii goes with communicating with oneself, the inner dialogue of thought and reflection.

Group communication in item iii goes with classroom teaching, where one addresses a bounded, organised group.

Interpersonal communication in item iv goes with corridor discussion, the direct informal exchange between individuals.

The four types thus range from the widest mediated reach down to the private conversation within the self.