Question post text
a. "None of the above" for questions C1 AND C4? (>>F1)
b. "None of the above" for question C1 BUT NOT for C4 (>>E1)
c. "None of the above" for question C4 BUT NOT for C1 (COMPLETE D, SKIP E)
d. "None of the above" NOT checked for C1 AND C4 (PROCEED TO D1)