Selecting transistor for switching relay ?

Hi guys, I wanna switch Relay(6 Volt DC Input ,250 V AC output ) using the output of HT12D IC (I used BC547 independently and also wit  CL00 Transistor) but relay is not switching properly ,Please guide me with a way to select  the transistor????? A timely favour, however trivial its material value is, is invaluable.                                                   ---------------------------------------Thiruvalluvar)

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