Classroom Communication is normally considered as

The expected answer is Effective. Classroom communication is a purposeful exchange between teacher and learners meant to transmit content and check understanding. It is judged by whether the message is received, understood and acted upon, which is why teacher-training literature describes it as effective communication, with feedback as the measure of its success.

• Cognitive is wrong because it names a domain of learning (knowledge and intellectual skills, as in Bloom's taxonomy), not the nature of communication. It describes what is learned, not how the message flows.
• Affective is wrong for the same reason. It refers to the domain of attitudes, interests and values. Classroom communication can influence affect, but that is an outcome, not its defining character.
• Selective is not the normal descriptor. Selective perception and selective exposure are psychological concepts about what people attend to, not a standard classification of classroom communication.

Core concept: the teaching-learning process as two-way communication, with feedback. This links to Teaching Aptitude in Paper I and to the Mains theme of effective teacher-student interaction in government schools.

Trap: aspirants pick Cognitive or Affective because they recall Bloom's domains and assume every classroom term must belong to one of them.