$1)$ In the multidimensional model, a dimension:

Must have exactly one hierarchy

May have many hierarchies with at least one common attribute

Must have at least two hierarchies

Nothing from above

$2)$ The data stored in dimension is

Time$-$independent $($stable in time$)$

Time$-$dependent $($may vary in time$)$

All from above

Nothing from above

$3)$ In the multidimensional model, the fact measures

Are time independent data

Depend on some dimensions

Are Time dependent data

Nothing from above