Which of the following is not a channel commonly used for business communication?

• A. Email
• B. Face-to-face
• C. Letters
• D. Social media posts publicly

Answer: (D)

In business communication, you choose channels that are appropriate for the message in terms of privacy, formality, and the level of two-way interaction. Email, face-to-face talks, and letters are standard, reliable methods for sending important information, discussing details, and keeping a written record. They’re designed for confidential or semi-formal exchanges and allow back-and-forth dialogue in a controlled way.

Public social media posts, while useful for marketing, announcements, or public engagement, are not typically used for direct, formal business communication. They are usually one-to-many, less private, and harder to control or document precisely, which makes them unsuitable for sharing sensitive information or negotiating terms. So the option involving public social media posts isn’t a common channel for routine business correspondence, compared with the established channels of email, face-to-face, and letters.