For the below given circuit
(a) all the devices are gated together
(b) T3 and T4 are gated together
(c) T3 and T1 are gated together
(d) T3 and T2 are gated together
I have been asked this question in unit test.
This intriguing question comes from Single Phase FW AC-DC-2 topic in section Converters of Power Electronics