What is the IUPAC name of the below compound?
\(\begin{array}{*{20}{c}} {{\rm{C}}{{\rm{H}}_3}}\\ {}\\ {} \end{array}\begin{array}{*{20}{c}} { - {\rm{CH}}}\\ |\\ {{\rm{\;\;C}}{{\rm{H}}_3}} \end{array}\begin{array}{*{20}{c}} { - {\rm{C}}{{\rm{H}}_2} - {\rm{C}}{{\rm{H}}_2} - {\rm{Cl}}}\\ {}\\ {} \end{array}\)1
2-methyl-3-chlorobutane
2
1-chloro-3-methylbutane
3
1-chloropentane
4
2-methyl-4-chlorobutane