Find Alice and Bob's Common Key K by Using the Diffie-Hellman-Merkle

Multiple Choice

Find Alice and Bob's common key K by using the Diffie-Hellman-Merkle key exchange scheme with the given values of M, n, a, and b.
- $\begin{array}{llll}\hline \mathrm{M} & \mathrm{n} & \mathrm{a} & \mathrm{b} \\\hline 13 & 11 & 7 & 4 \\\hline\end{array}$

A) 3
B) 11
C) 5
D) 4