In quinary, the base number must be $5$, and all the digits in the brackets must be less than $5$. 
Which of the following is the correct expression of quinary (base $5$ numeral system)? 
Options:
1) $\left (8231\right )\_5$ 
2) $\left (2001\right )\_5$ 
3) $\left (4341\right )\_7$ 
4) $\left (2345\right )\_5$ 