Themal decomposition of ammonium tetrafluoroberyllate gives X, heating Beryllium oxide with carbon and `Cl_(2)` gas at 600-800 K gives Y and reduction of Y using is `LiAlH_(4)` is Z. Then
I) X has electronegativity difference of 2.5 and exhibit covalent nature
II) Y shows acidic nature in water
III) The O-H bond strengthens in the hydrated ion formed on the hydrolysis of Y
IV) In Z, the oxidationi state of H is +1

Options

A. I, II, III, IV are correct
B. I, II, III are correct
C. I, II are correct
D. I, III, IV are correct