The alignment of the second item on the baseline is not correct if I use the command \dfrac{}{}.
How to solve this problem without using the command \framed ?

Best regards,

Fabrice

\starttext
\startitemize[columns,A,joinedup,three][stopper={)},style=bold]
\item  $f^{\prime}(x) = \dfrac{- 1}{(x + 1)^2}$
\item  $f^{\prime}(x) = 1$
\item  $f^{\prime}(x) = \dfrac{1}{x + 1}$
\stopitemize
\stoptext