A business teacher shares details about an effective cross-curricular lesson plan with a math colleague...

Horizontal communication occurs between individuals at the same organizational level, such as between two teachers (peers). The business teacher sharing a lesson plan with a math colleague exemplifies this. Option B (downward) involves communication from superiors to subordinates. Option C (vertical) is a general term for upward or downward communication. Option D (upward) refers to communication from subordinates to superiors. This question aligns with the Communication and Career Development category, emphasizing workplace communication.