The compound shown is 1,2-dichloro-3-methylcyclopropane with both chlorine atoms and the methyl group on the same face of the ring. Which statement is correct?

With both Cl cis, C1 and C2 have opposite configurations ($R$ and $S$), and a mirror plane passes through C3 and bisects the C1-C2 bond, so the molecule is achiral. C3 carries H, $\mathrm{CH}{}_3$, (R)-$\mathrm{CHCl}$ and (S)-$\mathrm{CHCl}$ arms: constitutionally identical arms of opposite configuration, so C3 is pseudoasymmetric. Moving $\mathrm{CH}{}_3$ to the other face gives a different (diastereomeric) meso compound, so C3 is stereogenic. With $R$ ranked above $S$, the all-cis arrangement shown has the descriptor $r$ at C3; the constitution has 4 stereoisomers in total (two meso forms and one pair of enantiomers).