The circuit in the diagram contains four switches, S₁, S₂, S₃ and S₄.
Which three switches must be closed for the heater to work?
1 )
S₁, S₂ and S₃
S₁, S₂ and S₄
3 )
S₁, S₃ and S₄
4 )
S₂, S₃ and S₄
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