Evaluating Structural Formulas II

Two isomeric structural formulas (I & II) are drawn below. Questions concerning these structures shoud be answered by entering a number or selecting the desired response as designated.

3-D conformational drawings of two isomeric piperidine triols, Structures I and II

1. How many stereogenic centers are present in Structure I? How many stereogenic centers are present in Structure II?
2. Which of the following statements best describes the relationship of Structures I and II? They are different conformations of diastereomers. They are different conformations of enantiomers. They are different conformations of the same compound. They are identical conformations of the same compound.