Dextrorotatory and levorotatory are a set of two terms that designate the direction polarised light is rotated to by a specific compound. Chiral compounds can be identified as being chiral due to their optical activity only. The optical activity is a physically measurable parameter, determined in polarimeters and calculated to a specific optical activity by dividing by concentration and length of the cuvette. Rotation to the right is indicated by a $(+)$ sign, while rotation to the left is indicated by a $(-)$.
The names dextro- and levorotatory derive from the Latin words dexter (right, as in right hand) and laevus (left, as in left hand).
The D/L-nomenclature is entirely different from the above. While the prefixes D and L also derive from the same Latin words, they are used in a different way. They key to D/L-nomenclature is a Fischer projection. If a chiral molecule is drawn in such a (linear) projection, and the group of the highest priority (typically the group with the highest oxidation state) is at the top, a compound is defined as L if the non-hydrogen atom on the lowest asymmetric carbon of the chain points to the left. Likewise, if it points to the right, a compound is termed D.
From left to right: D-Glyceraldehyde, L-tartaric acid, D-tartaric acid.
It is very important to know that there is no connection between D/L and the direction of rotation of polarised light! Likewise, one cannot deduce the direction of optical activity from knowing whether a compound is (R) or (S). D/L and (R)/(S) can be determined on paper or via crystal structures while $(+)/(-)$ can only be determined experimentally in a polarimeter or similar experiments.
That D-glyceraldehyde is dextrorotatory is a mere (but maybe lucky) coincidence.
Therefore, the correct answers to your given question are (2) (it rotates to the left; $(-)$) and (4) (it relates back to D-Glyceraldehyde).
