D-(+)-Glyceraldehyde \(\overset{\xrightarrow{(i)HCN}}{(ii)H_2O/H^+\\{(iii)HNO_3}}\)
The products formed in the above reaction are
(1) Two optically active products
(2) One optically active and one meso product
(3) One optically inactive and one meso product.
(4) Two optically inactive products