Despite the heavy reliance on e-mail, in certain situations calling may be the most efficient channel of communication, whether mobile or on your office line. Be sure to understand professional expectations for telephone, cell phone, and voice mail etiquette.

Identify the telephone etiquette that will make your telephone calls productive. Check all that apply.

Avoid telephone tag.

Be brisk when rushed.

Be professional and courteous.

Plan a mini-agenda.

End the call politely.

Option c and e                            

Explanation:

In simple words, Proper telephone etiquette becomes vital to business success as it is typically a consumer's initial point of contact so that reflects how your management  will handle them in those other communications. Ensure sure any consumer that calls your company gets a perfect, lasting experience.

Thus, one should talk to the client politely and be professional during the talks as it makes a positive impact of personality on the client.