Can you help me solve this question please!!! I have tried to solve this but I am really confused

Suppose we gave a method for encoding instances of SAT as strings over {0, 1}. In this problem, we consider encoding instances of the decision problem Decision Longest Path.

A. Devise, in detail, a method for encoding an instance G, s, t, K of Decision Longest Path as a string over {0, 1}. You may assume that the vertex set is V = {1, 2, . . . , n}, for some n 0.

B. Let G2 be the directed graph G2 = (V2, E2) = ({1, 2, 3, 4}, {(1, 2),(1, 4),(2, 3),(3, 4)}). Using your encoding method, give the steps required to encode G2, 1, 4, 2 as a binary string. Give the substrings that are encoded as well as the final encoded instance.

C. How many bits are used to encode G2, 1, 4, 2?