Study the following information to answer the given questions:
In a certain code ‘a friend of mine’ is written as ‘4 9 1 6’  ‘mine lots of metal’ is written as ‘3 1 0 9’ and ‘a piece of metal’ is written as ‘7 1 6 3’.

Q:

What does ‘9’ stand for?

• 1
  of
• 2
  mine
• 3
  friend
• 4
  lots
• 5
  metal