In a certain code language,
'W + V' means 'W is the sister of V',
'W # V' means 'W is the husband of V',
'W $ V' means 'W is the daughter of V',
'W % V' means 'W is the mother of V',
'W @ V' means 'W is the brother of V'.
Based on the above, which of the following expressions denotes that 'Y is the wife of Z'?
1
Z @ R + K + P % Y
2
P $ Y % R + K % Z
3
Y % P # K + R % Z
4
Y % P + K @ R $ Z