Considering the reaction sequence given below, the correct statement(s) is(are)

(A) P can be reduced to a primary alcohol using NaBH4.
(B) Treating P with conc. NH4OH solution followed by acidification gives Q.
(C) Treating Q with a solution of NaNO2 in aq. HCl liberates N2.
(D) P is more acidic than CH3CH2COOH.