Question: In the oxaciclohexane-type conformer of sugar -D - (+) - glucopyranose: 
 Options:  <1> One of the OH- groups is axial, but the remaining substituents are equatorial. <2> The CH2OH group is axial but the remaining groups are equatorial. <3> All groups are axial. <4> All groups are equatorial. <5> The CH2OH group is equatorial but the remaining groups are axial.
4