Do the molecules (i) 1,2-diisopropylcyclopentane and (ii) cyclobutane-1,2-diol have any achiral stereoisomers?

Both molecules have an achiral stereoisomer.

Neither of the molecules has an achiral stereoisomer.

Only cyclobutane-1,2-diol has an achiral stereoisomer.

Only 1,2-diisopropylcyclopentane has an achiral stereoisomer.