Q: P x Q means P is the sister of Q ; P + Q means P is the father of Q ; P - Q means P is the mother of Q. Which of the following means S is the aunt of T ?

• 1
  T x M + S
• 2
  S + T x M
• 3
  S x M + T
• 4
  S x M + R - T
• 5
  None of these