State the Boolean functions that can be used to describe the following situations.
(a) There is an output when switch A is closed and either switch B or switch C is closed.
(b) There is an output when either switch A or switch B is closed and either switch C or switch D is closed.
(c) There is an output when either switch A is opened or switch B is closed.
(d) There is an output when switch A is opened and switch B is closed.
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