Peplau's Theory Focuses on the Therapeutic Relationship as the Key

Peplau's theory focuses on the therapeutic relationship as the key to successful nursing intervention.Which of the following is correct about Peplau's theory?

A) It is a grand theory that demonstrates that defining nursing was more important than application to practice.
B) Her theory developed from her work with oncology patients.
C) The theory describes six key nursing roles that are flexibly used, depending on the practice setting.
D) Her theory describes nursing roles as mother, technician, salesman, scholar, and advocate.