When Zakat became Farz?

A. 1st Hijri
B. 2nd Hijri
C. 3rd Hijri
D. 4th Hijri

Zakat Farziyat (Obligatory)

when zakat became obligatory?

Zakat became farz in 2nd Hijri, similarly when namaz became farz? Namaz also became Farz in 2nd Hijri (A.H)