Without any additional circuitry, an 8:1 MUX can be used to obtain:...

Without any additional circuitry, an 8:1 MUX can be used to obtain: 

(1) Some but not all Boolean functions of 3 variables (2) All function of 3 variables but none of 4 variables (3) All functions of 3 variables and some but not all of 4 variables (4) All functions of 4 variables
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Answer :

Without any additional circuitry, an 8:1 MUX can be used to obtain: All functions of 4 variables.

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1
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A
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