${\text{CH}}_3{\text{—CHCl—CH}}_2{\text{—CH}}_3$ has a chiral center. Which one of the following represents its $R$ configuration?

Using Cahn-Ingold-Prelog priority:$-\text{Cl}$ (highest atomic number)$-{\text{C}}_2{\text{H}}_5$ $-{\text{CH}}_3$ $-\text{H}$ (lowest)In a Fischer projection, if the lowest priority group (4) is on the vertical line, the direction 1 $\to$ 2 $\to$ 3 gives the configuration ($R$ for clockwise, $S$ for counter-clockwise). If (4) is on the horizontal line, the result is reversed.For configuration (C): $\text{Cl}$ (top), $\text{H}$ (bottom), ${\text{CH}}_3$ (right), ${\text{C}}_2{\text{H}}_5$ (left). Group 4 is on vertical. 1($\text{Cl}$) $\to$ 2(${\text{C}}_2{\text{H}}_5$) $\to$ 3(${\text{CH}}_3$) is clockwise. This is $R$.