Which of the Following Is the Relationship Between the Required $\times$

Which of the following is the relationship between the required reserve ratio (RRR) and the demand deposit multiplier?

A) The demand deposit multiplier = 1/RRR
B) The demand deposit multiplier = RRR $\times$ change in reserves
C) The demand deposit multiplier = 1/(1 + RRR)
D) RRR = demand deposit multiplier
E) The demand deposit multiplier = 1/(1 - RRR) .