Final answer:
Typing skills are the least likely telephone activity a support agent needs to develop for telephone communication, as the role primarily requires listening, speaking, and problem-solving skills.
Step-by-step explanation:
In a telephone communication, the least likely telephone activity a support agent needs to develop is 3) Typing skills. While listening, speaking, and problem-solving skills are directly related to effective telephone communication, typing skills are generally not utilized during a phone conversation. However, typing skills may still be important for a support agent to document the conversation after it has ended or to input data into a computer system during or following the call.
Good communication skills are emphasized in various job ads, and are essential for tasks like making presentations, interacting with customers, and asking for a raise. Therefore, while typing skills may be valuable in some aspects of a support agent's role, they are not the primary skill used during a telephone conversation.