If ‘U × V’ means ‘U is the daughter of V’, ‘U + V’ means ‘U is the husband of V’, and ‘U – V’ means ‘U is the sister of V’, then what does ‘W + X – Y × Z’ mean?
1
W is the uncle of Z
2
W is the brother-in-law of Z
3
Z is the mother-in-law of W
4
W is the son-in-law of Z