When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form is
\begin{matrix} CHO \\ | \\ CH_2 \\ | \\ CHOH \\ | \\ CHOH \\ | \\ CHOH \\ | \\ CH_2OH \end{matrix}[IIT, 2012]
d-configuration
number of chiral centres that can be changed = 3
number of stereo -isomers = 8