D- -Erythrose has the formula and the D in its name implies that it can be degraded to...

D- -Erythrose has the formula and the D in its name implies that it can be degraded to D-( +)-glyceraldehyde. The (-) in its name implies that D-(-)-erythrose is optically active (levorotatory). When D-(-)-erythrose is reduced (using H₂ and a nickel catalyst), it gives an optically inactive product of formula Knowing the absolute configuration of D-(+)-glyceraldehyde (Section 5-14), determine the absolute configuration of D-(-)-erythrose.