A nurse is providing teaching about self-administration of insulin to the parent of a school-age child who has a new diagnosis of diabetes mellitus. Which of the following statements by the parents indicates a need for further teaching
a. "I will be sure my child aspirates before injecting insulin"
b. "the insulin can be injected anywhere where there is adipose tissue"
c. "I will be sure by child rotates sites after 5 injections in one area"
d. "the insulin should be injected at a 90 degree angle"