Which description is ture in normal operation characteristics of Thyristor?

A、Duetotheloadinductance,thyristormayflowthroughthereverseanodecurrent;
B、Aslongasthegatehasatriggercurrent,thethyristorcanbeturnedon;
C、Oncethethyristoristurnedon,thegatelosesitscontrolfunction;
D、Inordertoturnoffthethyristorconducting,theanodecurrentflowingthroughthethyristorshouldbereducedbelowtheholdingcurrent