The $4-$input neuron will output one if the input is $1111$ and zero if the input is $1110.$ The output will be zero when and only when the input is$.$

a$.$

$0101$ or $1000$ or $1100$

b$.$

$0000$ or $1110$ or $0111$

c$.$

$1001$ or $1111$ or $1011$

d$.$

$1000$ or $0110$ or $1100$