Written communication uses written or printed words that can be seen and referred to later. When a teacher records key points on the board,students can read and copy them,creating a visual record of the lesson. This clearly falls under written communication,even though it occurs alongside speech.
Option A:
On the board,the teacher encodes meanings into words and phrases,just as in a handout or textbook. The permanence of the text for the duration of the class distinguishes it from purely oral explanations. Hence written is the most accurate label.
Option B:
Oral communication would refer to the spoken explanation,which is another aspect of the lesson but not the focus of the stem.
Option C:
Non verbal communication includes gestures and facial expressions rather than explicit written words,so it does not capture the main point here.
Option D:
Visual only is an imprecise description that does not highlight the linguistic nature of the written words and is not a standard classification in UGC NET communication theory.
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