If a Practitioner Does Not Know the Answer to a Reporter's

If a practitioner does not know the answer to a reporter's question, which one of the following is the correct response?

A) Give the reporter other information the practitioner is certain to be correct.
B) Say "I don't know" and promise to provide the information later.
C) Say that the information is "off the record" and will be disseminated later.
D) Tell the reporter that the information requested is not relevant to the story.
E) Say "No comment" rather than look like you don't know.B