Which of the Following Statements Applies to the Use of Telephone

Which of the following statements applies to the use of telephone counselling?

A) Therapists cannot use the telephone to calm or advise clients between face-to-face therapy sessions.
B) Use of the telephone for suicide hotlines and crisis counselling is not well established.
C) Telephone therapy is seriously undermined by a lack of visual cues and personal contact.
D) Telephone therapy has been found to be both as cost-efficient and as effective as face-to-face therapy.