Which of the following statements is true with respect to the cognitive interview and enhanced ...

Which of the following statements is true with respect to the cognitive interview and enhanced cognitive interview?
a. The enhanced cognitive interview incorporates all the elements of the cognitive interview.
b. Only some officers in Canada have been trained to use the cognitive interview.
c. No significant differences have been found between the effectiveness of the cognitive interview and that of the enhanced cognitive interview.
d. Compared to the standard police interview, the cognitive interview and enhanced cognitive interview produce more accurate information without an increase in inaccurate information.
e. all of the above