How to compute the output equation of Z in the below fig?

Screenshot $2022-01-06131345.$png

Answer choices

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Z $=$ X$1*$W$1+$X$2*$W$2+$X$3$W$3$

Z $=$ X$1*$W$1+$X$2*$W$2+$X$3$W$3+$B

Z $=$X$1+$X$2+$X$3+$B

Z $=$ W$1+$W$2+$W$3+$B