$8^{23454934725}$ is an incredibly large number. Yet you don't need a supercomputer to figure out what $8^{23454934725}(mod7)$ is$.$ In fact, you can do it in your head. What is the value of $8^{23454934725}(mod7)?($Hint: What was one of the key facts about modular arithmetic that makes the DiffieHellman system work?$)$

$0$

$1$

$2$

$3$

$4$